參數(shù)資料
型號: MCP23008-E/P
廠商: Microchip Technology
文件頁數(shù): 5/44頁
文件大?。?/td> 0K
描述: IC I/O EXPANDER I2C 8B 18DIP
產(chǎn)品培訓(xùn)模塊: GPIO Expanders
標(biāo)準(zhǔn)包裝: 25
接口: I²C
輸入/輸出數(shù): 8
中斷輸出:
頻率 - 時鐘: 1.7MHz
電源電壓: 1.8 V ~ 5.5 V
工作溫度: -40°C ~ 125°C
安裝類型: 通孔
封裝/外殼: 18-DIP(0.300",7.62mm)
供應(yīng)商設(shè)備封裝: 18-PDIP
包裝: 管件
包括: POR
產(chǎn)品目錄頁面: 684 (CN2011-ZH PDF)
配用: GPIODM-KPLCD-ND - BOARD DEMO LCD GPIO EXP KEYPAD
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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