参数资料
型号: MCP23S18T-E/SP
元件分类: 微控制器/微处理器
英文描述: PIA-GENERAL PURPOSE, PDIP28
封装: 0.300 INCH, PLASTIC, SPDIP-28
文件页数: 14/56页
文件大小: 738K
代理商: MCP23S18T-E/SP
2008 Microchip Technology Inc.
DS22103A-page 21
MCP23018/MCP23S18
1.6.4
DEFAULT COMPARE REGISTER
FOR INTERRUPT-ON-CHANGE
The default comparison value is configured in the
DEFVAL register. If enabled (via GPINTEN and INT-
CON) to compare against the DEFVAL register, an
opposite value on the associated pin will cause an
interrupt to occur.
REGISTER 1-6:
DEFVAL – DEFAULT VALUE REGISTER
R/W-0
DEF7
DEF6
DEF5
DEF4
DEF3
DEF2
DEF1
DEF0
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
DEF7:DEF0: Sets 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.
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