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MCP23S17T-E/SO Datasheet(PDF) 22 Page - Microchip Technology

Part # MCP23S17T-E/SO
Description  16-Bit I/O Expander with Serial Interface
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP23S17T-E/SO Datasheet(HTML) 22 Page - Microchip Technology

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MCP23017/MCP23S17
DS20001952C-page 22
 2005-2016 Microchip Technology Inc.
3.5.7
PULL-UP RESISTOR
CONFIGURATION 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 k
 resistor.
3.5.8
INTERRUPT FLAG 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 3-7:
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
PU<7:0> Controls the weak pull-up resistors on each pin (when configured as an input)
1
= Pull-up enabled
0
= Pull-up disabled
REGISTER 3-8:
INTF: INTERRUPT FLAG REGISTER (ADDR 0x07)
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
INT<7:0>: Reflects the interrupt condition on the port. It reflects the change only if interrupts are
enabled per GPINTEN<7:0>.
1
= Pin caused interrupt.
0
= Interrupt not pending


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