MCP23008/MCP23S08 - Microchip

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MCP23008/MCP23S08 1.6.7 PULL-UP RESISTOR CONFIGURATION (GPPU) REGISTER The GPPU register controls the pull-up resistors for the port pins. If a bit is set and the corresponding pin is configured as an input, the corresponding port pin is internally pulled up with a 100 kΩ resistor. REGISTER 1-7: GPPU – GPIO PULL-UP RESISTOR REGISTER (ADDR 0x06) R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 PU7 PU6 PU5 PU4 PU3 PU2 PU1 PU0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7-0 PU7:PU0: These bits control the weak pull-up resistors on each pin (when configured as an input) . 1 = Pull-up enabled. 0 = Pull-up disabled. DS21919E-page 16 © 2007 Microchip Technology Inc.
1.6.8 INTERRUPT FLAG (INTF) REGISTER The INTF register reflects the interrupt condition on the port pins of any pin that is enabled for interrupts via the GPINTEN register. A ‘set’ bit indicates that the associated pin caused the interrupt. This register is ‘read-only’. Writes to this register will be ignored. REGISTER 1-8: INTF – INTERRUPT FLAG REGISTER (ADDR 0x07) MCP23008/MCP23S08 Note: INTF will always reflect the pin(s) that have an interrupt condition. For example, one pin causes an interrupt to occur and is captured in INTCAP and INF. If before clearing the interrupt another pin changes, which would normally cause an interrupt, it will be reflected in INTF, but not INTCAP. R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 INT7 INT6 INT5 INT4 INT3 INT2 INT1 INT0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7-0 INT7:INT0: These bits reflect the interrupt condition on the port. Will reflect the change only if interrupts are enabled (GPINTEN) . 1 = Pin caused interrupt. 0 = Interrupt not pending. © 2007 Microchip Technology Inc. DS21919E-page 17
Page 1 and 2: Features • 8-bit remote bidirecti
Page 3 and 4: © 2007 Microchip Technology Inc. D
Page 5 and 6: 1.0 DEVICE OVERVIEW The MCP23X08 de
Page 7 and 8: FIGURE 1-1: MCP23008 I 2 C DEVICE P
Page 9 and 10: 1.5 GPIO Port The GPIO module conta
Page 11 and 12: 1.6.2 INPUT POLARITY (IPOL) REGISTE
Page 13 and 14: 1.6.4 DEFAULT COMPARE (DEFVAL) REGI
Page 15: 1.6.6 CONFIGURATION (IOCON) REGISTE
Page 19 and 20: 1.6.10 PORT (GPIO) REGISTER The GPI
Page 21 and 22: 1.7 Interrupt Logic The interrupt o
Page 23 and 24: 2.0 ELECTRICAL CHARACTERISTICS Abso
Page 25 and 26: MCP23008/MCP23S08 FIGURE 2-1: LOAD
Page 27 and 28: TABLE 2-2: I 2 C BUS DATA REQUIREME
Page 29 and 30: FIGURE 2-6: SPI OUTPUT TIMING CS SC
Page 31 and 32: TABLE 2-4: GP AND INT PINS AC Chara
Page 33 and 34: 3.0 PACKAGING INFORMATION 3.1 Packa
Page 35 and 36: 18-Lead Plastic Small Outline (SO)
Page 37 and 38: 20-Lead Plastic Shrink Small Outlin
Page 39 and 40: APPENDIX A: REVISION HISTORY Revisi
Page 41 and 42: PRODUCT IDENTIFICATION SYSTEM MCP23
Page 43 and 44: Note the following details of the c

MCP23008/MCP23S08 - Microchip

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