Motorola Semiconductor Engineering Bulletin EB422 Enhanced

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$Set of General Math and Motor Control Functions for ARM Cortex ...$

Freescale Semiconductor, Inc... Engineering Bulletin Freescale Semiconductor, Inc. 0045 003b PPROG EQU $3B 0046 * BIT EQUATES FOR PPROG 0047 0020 ELAT EQU $20 0048 0001 EPGM EQU $01 0049 * 0050 0051 * MEMORY CONFIGURATION EQUATES 0052 * 0053 b600 EEPMSTR EQU $B600 Start of EEPROM 0054 b7ff EEPMEND EQU $B7FF End of EEPROM 0055 * 0056 d000 EPRMSTR EQU $D000 Start of EPROM 0057 ffff EPRMEND EQU $FFFF End of EPROM 0058 * 0059 0000 RAMSTR EQU $0000 0060 01ff RAMEND EQU $01FF 0061 0062 * DELAY CONSTANTS 0063 * 0064 0db0 DELAYS EQU 3504 Delay at slow baud 0065 021b DELAYF EQU 539 Delay at fast baud 0066 * 0067 1068 PROGDEL EQU 4200 2 ms prog delay 0068 * At 2.1 MHz 0069 0070 ******************************************* 0071 bf00 ORG$BF00 0072 ******************************************* 0073 0074 * Next two instructions provide a predictable place 0075 * to call PROGRAM and UPLOAD even if the routines 0076 * change size in future versions. 0077 * 0078 bf00 7e bf 13 PROGRAM JMP PRGROUT EPROM prog utility 0079 bf03 UPLOAD EQU * Upload utility 0080 0081 ********************************************* 0082 * UPLOAD - Utility subroutine to send data from 0083 * inside the MCU to the host via the SCI interface. 0084 * Prior to calling UPLOAD set baud rate, turn on SCI 0085 * and set Y=first address to upload. 0086 * Bootloader leaves baud set, SCI enabled, and 0087 * Y pointing at EPROM start ($D0000) so these default 0088 * values do not have to be changed typically. 0089 * Consecutive locations are sent via SCI in an 0090 * infinite loop. Reset stops the upload process. 0091 ********************************************* 0092 bf03 ce 10 00 LDX #$1000 Point to registers 0093 bf06 18 a6 00 UPLOOP LDAA 0,Y Read byte 0094 bf09 1f 2c 80 fc BRCLR SCSR1,X $80 * Wait for TDRE 0095 bf0d a7 2f STAA SCDRL,X Send it 0096 bf0f 18 08 INY 0097 bf11 20 f3 BRA UPLOOP Next... 0098 EB422 16 MOTOROLA For More Information On This Product, Go to: www.freescale.com
Freescale Semiconductor, Inc... EB422 Freescale Semiconductor, Inc. Engineering Bulletin Listing 8. MC68HC711EA9 Boatloader ROM Listing 0099 ***************************************************** 0100 * PROGRAM - Utility subroutine to program EPROM. 0101 * Prior to calling PROGRAM set baud rate, turn on SCI 0102 * set X=2ms prog delay constant, and set Y=first 0103 * address to program. SP must point to RAM. 0104 * Bootloader leaves baud set, SCI enabled, X=4200 0105 * and Y pointing at EPROM start ($D000) so these 0106 * default values don’t have to be changed typically. 0107 * Delay constant in X should be equivalent to 2 ms 0108 * at 2.1 MHz X=4200; at 1 MHz X=2000. 0109 * At external voltage source is required for EPROM 0110 * programming. 0111 * This routine uses 2 bytes of stack space 0112 * Routine does not return. Reset to exit. 0113 ***************************************************** 0114 bf13 PRGROUT EQU * 0115 bf13 3c PSHX Save prog dly 0116 bf14 cd 10 00 LDX #$1000 Point to regs 0117 0118 * Send $FF to indicate ready for program data 0119 0120 bf171f 2c 80 fc BRCLR SCSR1,X $80 * Wait for TDRE 0121 bf1b 86 ff LDAA #$FF 0122 bf1d a7 2f STAA SCDRL,X 0123 0124 bf1f WAIT1 EQU * 0125 bf1f 1f 2c 20 fc BRCLR SCSR1,X $20 * Wait for RDRF 0126 bf23 e6 2f LDAB SCDRL,X Get rx byte 0127 bf25 18 e1 00 CMPB $0,Y Already prog? 0128 bf28 27 1d BEQ DONEIT Skip prog cyc 0129 bf2a 86 20 LDAA #ELAT EPROM in prog 0130 bf2c a7 3b STAA PPROG,X 0131 bf2e 18 e7 00 STAB 0,Y Write data 0132 bf31 86 21 LDAA #ELAT+EPGM 0133 bf33 a7 3b STAA PPROG,X Prog start 0134 bf35 32 PULA Get dly const 0135 bf36 33 PULB into D-reg 0136 bf37 37 PSHB But keep dly 0137 bf38 36 PSHA on stack 0138 bf39 e3 0e ADDD TCNT,X Delay + TCNT 0139 bf3b ed 16 STD TOC1,X 2ms delay 0140 bf3d 86 80 LDAA #OC1F 0141 bf3f a7 23 STAA TFLG1,X Clear flag 0142 0143 bf41 1f 23 80 fc BRCLR TFLG1,X OC1F * Wait for dly 0144 bf45 6f 3b CLR PROG,X Prog stop 0145 * 0146 bf47 DONEIT EQU * 0147 bf47 1f 2c 80 fc BRCLR SCSR1,X $80 * Wait for TDRE 0148 bf4b 18 a6 00 LDAA $0,Y Get EPROM & 0149 bf4e a7 2f STAA SCDRL,X Xmit for verf 0150 bf50 18 08 INY Next location 0151 bf52 20 cb BRA WAIT1 Back for next 0152 * Loops indefinitely as long as more data sent. 0153 0154 *********************************************************** 0155 * Main bootloader starts here 0156 *********************************************************** 0157 * RESET vector bootloader starts here 0158 0159 bf54 BEGIN EQU * 0160 bf54 8e 01 ff LDS #RAMEND Initialise SP 0161 bf57 ce 10 00 LDX #$1000 Point at regs 0162 bf5a cc 00 20 LDD #$0020 Init baud for MOTOROLA 17 For More Information On This Product, Go to: www.freescale.com
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Motorola Semiconductor Engineering Bulletin EB422 Enhanced

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