参数资料
型号: MCP23008T-E/SS
厂商: Microchip Technology
文件页数: 5/44页
文件大小: 0K
描述: IC I/O EXPANDER I2C 8B 20SSOP
标准包装: 1,600
接口: I²C
输入/输出数: 8
中断输出:
频率 - 时钟: 1.7MHz
电源电压: 1.8 V ~ 5.5 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 20-SSOP(0.209",5.30mm 宽)
供应商设备封装: 20-SSOP
包装: 带卷 (TR)
包括: POR
配用: GPIODM-KPLCD-ND - BOARD DEMO LCD GPIO EXP KEYPAD
其它名称: Q2170569
2007 Microchip Technology Inc.
DS21919E-page 13
MCP23008/MCP23S08
1.6.4
DEFAULT COMPARE (DEFVAL)
REGISTER FOR INTERRUPT-ON-
CHANGE
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:
DEFVAL – DEFAULT VALUE REGISTER (ADDR 0x03)
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: 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.
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