ATmega32A Datasheet - Sunrom Technologies

More documents

Recommendations

Info

<strong>ATmega32A</strong>Assembly Code Example (1)USART_Transmit:; Wait for empty transmit buffersbis UCSRA,UDRErjmp USART_Transmit; Copy 9th bit from r17 to TXB8cbi UCSRB,TXB8sbrc r17,0sbi UCSRB,TXB8; Put LSB data (r16) into buffer, sends the dataout UDR,r16retC Code Example (1)void USART_Transmit( unsigned int data ){/* Wait for empty transmit buffer */while ( !( UCSRA & (1
<strong>ATmega32A</strong>The Transmit Complete (TXC) Flag bit is set one when the entire frame in the transmit ShiftRegister has been shifted out and there are no new data currently present in the transmit buffer.The TXC Flag bit is automatically cleared when a transmit complete interrupt is executed, or itcan be cleared by writing a one to its bit location. The TXC Flag is useful in half-duplexcommunication interfaces (like the RS485 standard), where a transmitting application must enterreceive mode and free the communication bus immediately after completing the transmission.When the Transmit Compete Interrupt Enable (TXCIE) bit in UCSRB is set, the USART TransmitComplete Interrupt will be executed when the TXC Flag becomes set (provided that global interruptsare enabled). When the transmit complete interrupt is used, the interrupt handling routinedoes not have to clear the TXC Flag, this is done automatically when the interrupt is executed.19.6.4 Parity GeneratorThe parity generator calculates the parity bit for the serial frame data. When parity bit is enabled(UPM1 = 1), the transmitter control logic inserts the parity bit between the last data bit and thefirst stop bit of the frame that is sent.19.6.5 Disabling the TransmitterThe disabling of the transmitter (setting the TXEN to zero) will not become effective until ongoingand pending transmissions are completed, that is, when the transmit Shift Register and transmitBuffer Register do not contain data to be transmitted. When disabled, the transmitter will no longeroverride the TxD pin.19.7 Data Reception – The USART ReceiverThe USART Receiver is enabled by writing the Receive Enable (RXEN) bit in the UCSRB Registerto one. When the receiver is enabled, the normal pin operation of the RxD pin is overriddenby the USART and given the function as the receiver’s serial input. The baud rate, mode of operationand frame format must be set up once before any serial reception can be done. Ifsynchronous operation is used, the clock on the XCK pin will be used as transfer clock.19.7.1 Receiving Frames with 5 to 8 Data BitsThe receiver starts data reception when it detects a valid start bit. Each bit that follows the startbit will be sampled at the baud rate or XCK clock, and shifted into the receive Shift Register untilthe first stop bit of a frame is received. A second stop bit will be ignored by the receiver. Whenthe first stop bit is received, that is, a complete serial frame is present in the receive Shift Register,the contents of the Shift Register will be moved into the receive buffer. The receive buffercan then be read by reading the UDR I/O location.The following code example shows a simple USART receive function based on polling of theReceive Complete (RXC) Flag. When using frames with less than eight bits the most significant8155C–AVR–02/11157
Page 3 and 4:
ATmega32A2. OverviewThe Atmel ® AV
Page 5:
ATmega32Ametrical drive characteris
Page 9 and 10:
ATmega32A6.3.1 SREG - AVR Status Re
Page 11 and 12:
ATmega32A6.4.1 The X-register, Y-re
Page 13 and 14:
ATmega32AFigure 6-5.Single Cycle AL
Page 15:
ATmega32AA return from an interrupt
Page 18 and 19:
ATmega32AFigure 7-2.Data Memory Map
Page 20 and 21:
ATmega32AEEPROM data corruption can
Page 22 and 23:
ATmega32ASupport - Read-While-Write
Page 24 and 25:
ATmega32AThe next code examples sho
Page 26 and 27:
ATmega32A8.1.3 Flash Clock - clk FL
Page 28 and 29:
ATmega32AThe CKSEL0 Fuse together w
Page 30 and 31:
ATmega32A8.7 Calibrated Internal RC
Page 32 and 33:
ATmega32A8.10 Register Description8
Page 34 and 35:
ATmega32Aface, Timer/Counters, Watc
Page 36 and 37:
ATmega32A9.8.4 Internal Voltage Ref
Page 38 and 39:
ATmega32A10. System Control and Res
Page 40 and 41:
ATmega32AFigure 10-3.MCU Start-up,
Page 42 and 43:
ATmega32AADC is used. To reduce pow
Page 44 and 45:
ATmega32AThe WDP2, WDP1, and WDP0 b
Page 46 and 47:
ATmega32Athe case if the Reset Vect
Page 48 and 49:
ATmega32A$382D out SPL,r16$382E sei
Page 50 and 51:
ATmega32A12. I/O Ports12.1 Overview
Page 52 and 53:
ATmega32AIf PORTxn is written logic
Page 54 and 55:
ATmega32AThe following code example
Page 56 and 57:
ATmega32AFigure 12-5. Alternate Por
Page 58 and 59:
ATmega32ATable 12-3.Table 12-4 and
Page 60 and 61:
ATmega32A• MOSI - Port B, Bit 5MO
Page 62 and 63:
ATmega32A12.3.3 Alternate Functions
Page 64 and 65:
ATmega32ATable 12-11. Overriding Si
Page 66 and 67:
Page 68 and 69:
ATmega32A12.4.13 PIND - Port D Inpu
Page 70 and 71:
ATmega32Alow level interrupt is sel
Page 73 and 74:
ATmega32A14. 8-bit Timer/Counter0 w
Page 75 and 76:
ATmega32ASignal description (intern
Page 77 and 78:
ATmega32Athe OCR0 value, the compar
Page 79 and 80:
ATmega32AFigure 14-5.CTC Mode, Timi
Page 81 and 82:
ATmega32AThe PWM resolution for the
Page 83 and 84:
ATmega32AFigure 14-9. Timer/Counter
Page 85 and 86:
ATmega32ATable 14-2. Waveform Gener
Page 87 and 88:
ATmega32AThe Output Compare Registe
Page 89 and 90:
ATmega32AFigure 15-1.T1/T0 Pin Samp
Page 91 and 92:
ATmega32A16. 16-bit Timer/Counter11
Page 93 and 94:
ATmega32Aput Compare Units” on pa
Page 95 and 96:
ATmega32Athe main code and the inte
Page 97 and 98:
ATmega32A16.5 Counter UnitThe main
Page 99 and 100:
ATmega32AThe ICR1 Register can only
Page 101 and 102:
ATmega32ARegister to either TOP or
Page 103 and 104:
ATmega32AA change of the COM1x1:0 b
Page 107: ATmega32AThe PWM resolution for the
Page 110: ATmega32AUsing the ICR1 Register fo
Page 113 and 114: ATmega32ATable 16-3 shows the COM1x
Page 115 and 116: ATmega32A• Bit 7 - ICNC1: Input C
Page 117 and 118: ATmega32AThe Input Capture is updat
Page 119 and 120: ATmega32A17. 8-bit Timer/Counter2 w
Page 121 and 122: ATmega32AFigure 17-2.DATA BUSCounte
Page 123 and 124: ATmega32AThe setup of the OC2 shoul
Page 125 and 126: ATmega32AFigure 17-5.CTC Mode, Timi
Page 127 and 128: ATmega32A17.7.4 Phase Correct PWM M
Page 129 and 130: ATmega32AFigure 17-9. Timer/Counter
Page 131 and 132: ATmega32A• If Timer/Counter2 is u
Page 133 and 134: ATmega32AA FOC2 strobe will not gen
Page 135 and 136: ATmega32A17.11.2 TCNT2 - Timer/Coun
Page 137 and 138: ATmega32A17.11.7 SFIOR - Special Fu
Page 139 and 140: ATmega32Acommunication cycle when p
Page 141 and 142: ATmega32AAssembly Code Example (1)S
Page 143 and 144: ATmega32A18.3 SS Pin Functionality1
Page 145 and 146: ATmega32A18.3.4 SPSR - SPI Status R
Page 147 and 148: ATmega32A19. USART19.1 Features19.2
Page 149 and 150: ATmega32A19.2.1 AVR USART vs. AVR U
Page 151 and 152: ATmega32ATable 19-1.Operating ModeA
Page 153 and 154: ATmega32AThe frame format used by t
Page 155: ATmega32AThe following code example
Page 159 and 160: ATmega32AAssembly Code Example (1)U
Page 161 and 162: ATmega32AThe PE bit is set if the n
Page 163 and 164: ATmega32AFigure 19-7.Stop Bit Sampl
Page 165 and 166: ATmega32AIf the receiver is set up
Page 167 and 168: ATmega32AThe following code example
Page 169 and 170: ATmega32A• Bit 0 - MPCM: Multi-pr
Page 171 and 172: ATmega32ATable 19-6.USBS Bit Settin
Page 173 and 174: ATmega32ATable 19-9.BaudRate(bps)Ex
Page 175 and 176: ATmega32ATable 19-11.BaudRate(bps)E
Page 177 and 178: ATmega32A20. Two-wire Serial Interf
Page 179 and 180: ATmega32Acondition is issued betwee
Page 181 and 182: ATmega32AFigure 20-6.Typical Data T
Page 183 and 184: ATmega32AFigure 20-9.Overview of th
Page 185 and 186: ATmega32A20.6 Using the TWIThe AVR
Page 187 and 188: ATmega32AAssembly code example C ex
Page 189 and 190: ATmega32ATable 20-2.Status Code(TWS
Page 191 and 192: ATmega32AFigure 20-12. Formats and
Page 195 and 196: ATmega32AThe upper seven bits are t
Page 197 and 198: ATmega32AFigure 20-16. Formats and
Page 201 and 202: ATmega32A4. The transfer must be fi
Page 203 and 204: ATmega32A20.9.2 TWCR - TWI Control
Page 205 and 206: ATmega32A20.9.5 TWAR - TWI (Slave)
Page 207 and 208:
Page 209 and 210:
ATmega32A22. Analog to Digital Conv
Page 211 and 212:
ATmega32AIf differential channels a
Page 213 and 214:
ATmega32Ain ADCSRA. The prescaler k
Page 215 and 216:
ATmega32ATable 22-1.ConditionADC Co
Page 217 and 218:
ATmega32AIf the user has a fixed vo
Page 219 and 220:
ATmega32AFigure 22-9.ADC Power Conn
Page 221 and 222:
INLATmega32AFigure 22-12. Integral
Page 223 and 224:
ATmega32ATable 22-2.Correlation bet
Page 225 and 226:
ATmega32ATable 22-4.MUX4:011010 ADC
Page 227 and 228:
ATmega32A22.9.4 SFIOR - Special Fun
Page 229 and 230:
ATmega32A• TMS: Test Mode Select.
Page 231 and 232:
ATmega32AThe TMS input must be held
Page 233 and 234:
ATmega32A23.8 Using the JTAG Progra
Page 235 and 236:
ATmega32A24.3.1 Bypass RegisterThe
Page 237 and 238:
ATmega32AThe active states are:•
Page 239 and 240:
ATmega32AFigure 24-4. General Port
Page 241 and 242:
ATmega32AFigure 24-7.Boundary-scan
Page 243 and 244:
ATmega32ATable 24-4.SignalNameBound
Page 245 and 246:
ATmega32ATable 24-5.SignalNameBound
Page 247 and 248:
ATmega32ATable 24-6.Algorithm for U
Page 249 and 250:
ATmega32ATable 24-7. ATmega32A Boun
Page 251 and 252:
ATmega32ATable 24-7. ATmega32A Boun
Page 253 and 254:
ATmega32A25. Boot Loader Support -
Page 255 and 256:
ATmega32AFigure 25-1.Read-While-Wri
Page 257 and 258:
ATmega32Amemory by SPM instruction.
Page 259 and 260:
ATmega32ANotes: 1. The different va
Page 261 and 262:
ATmega32A25.8.8 EEPROM Write Preven
Page 263 and 264:
ATmega32Asbiw loophi:looplo, 2brne
Page 265 and 266:
Page 267 and 268:
ATmega32A26. Memory Programming26.1
Page 269 and 270:
ATmega32ATable 26-4.Fuse Low ByteFu
Page 271 and 272:
ATmega32ATable 26-7.Signal Name inP
Page 273 and 274:
ATmega32Achanged. A Chip Erase must
Page 275 and 276:
ATmega32AFigure 26-3. Programming t
Page 277 and 278:
ATmega32A3. Set BS1 to “0” and
Page 279 and 280:
ATmega32A26.7.14 Parallel Programmi
Page 281 and 282:
ATmega32A26.9 SPI Serial Programmin
Page 283 and 284:
ATmega32Awithout chip erasing the d
Page 285 and 286:
ATmega32A26.9.4 SPI Serial Programm
Page 287 and 288:
ATmega32A• Update-DR: The program
Page 289 and 290:
ATmega32AFigure 26-14. Programming
Page 291 and 292:
ATmega32AFigure 26-15. JTAG Program
Page 293 and 294:
ATmega32AFigure 26-17. Virtual Flas
Page 295 and 296:
ATmega32A26.10.18 Reading the Flash
Page 297 and 298:
ATmega32A27. Electrical Characteris
Page 299 and 300:
ATmega32A27.3 Speed GradesFigure 27
Page 301 and 302:
ATmega32Aantees that a Brown-out Re
Page 303 and 304:
ATmega32ATable 27-3. SPI Timing Par
Page 305 and 306:
ATmega32ATable 27-5. ADC Characteri
Page 307 and 308:
ATmega32A28. Typical Characteristic
Page 309 and 310:
ATmega32AFigure 28-4.Active Supply
Page 311 and 312:
ATmega32AFigure 28-8.Idle Supply Cu
Page 313 and 314:
ATmega32AFigure 28-12. Idle Supply
Page 315 and 316:
ATmega32A28.5 Standby Supply Curren
Page 317 and 318:
ATmega32AFigure 28-20. Reset Pull-u
Page 319 and 320:
ATmega32AFigure 28-24. I/O Pin Sink
Page 321 and 322:
ATmega32AFigure 28-28. Reset Input
Page 323 and 324:
ATmega32AFigure 28-32. BOD Threshol
Page 325 and 326:
ATmega32AFigure 28-36. Calibrated 8
Page 327 and 328:
Page 329 and 330:
Page 331 and 332:
ATmega32AFigure 28-48. ADC Current
Page 333 and 334:
ATmega32A28.12 Current Consumption
Page 335 and 336:
ATmega32A29. Register SummaryAddres
Page 337 and 338:
ATmega32A30. Instruction Set Summar
Page 339 and 340:
ATmega32AMnemonics Operands Descrip
Page 341 and 342:
ATmega32A32. Packaging Information3
Page 343 and 344:
ATmega32A32.3 44M1DMarked Pin# 1 ID
Page 345 and 346:
ATmega32A34. Datasheet Revision His
Page 347 and 348:
ATmega32A8.9 Timer/Counter Oscillat
Page 349 and 350:
ATmega32A18.2 Overview ............
Page 351 and 352:
ATmega32A26 Memory Programming ....
Page 353:
Atmel Corporation2325 Orchard Parkw
show all

ATmega32A Datasheet - Sunrom Technologies

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?