MCP23S08/S Microchip Technology, MCP23S08/S Datasheet - Page 13

• Manufacturer Part Number: MCP23S08/S
• Description: 8-bit Input/Output Expander, SPI interface, 0C to +70C, Die-Waffle, WPAC
• Manufacturer: Microchip Technology

1.6.4
The default comparison value is configured in the
DEFVAL register. If enabled (via GPINTEN and
INTCON) to compare against the DEFVAL register, an
opposite value on the associated pin will cause an
interrupt to occur.
REGISTER 1-4:
© 2007 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-0
R/W-0
DEF7
DEFAULT COMPARE (DEFVAL)
REGISTER FOR INTERRUPT-ON-
CHANGE
DEF7:DEF0: These bits set the compare value for pins configured for interrupt-on-change from
defaults <7:0>. Refer to INTCON.
If the associated pin level is the opposite from the register bit, an interrupt occurs.
Refer to INTCON and GPINTEN.
R/W-0
DEF6
DEFVAL – DEFAULT VALUE REGISTER (ADDR 0x03)
W = Writable bit
‘1’ = Bit is set
R/W-0
DEF5
R/W-0
DEF4
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
MCP23008/MCP23S08
R/W-0
DEF3
R/W-0
DEF2
x = Bit is unknown
R/W-0
DEF1
DS21919E-page 13
R/W-0
DEF0
bit 0