參數(shù)資料
型號(hào): MCP23S08
廠商: Microchip Technology Inc.
英文描述: 8-Bit I/O Expander with Serial Interface
中文描述: 8位的I / O串行接口擴(kuò)展
文件頁(yè)數(shù): 7/40頁(yè)
文件大小: 498K
代理商: MCP23S08
2005 Microchip Technology Inc.
DS21919B-page 7
MCP23008/MCP23S08
1.5
GPIO Port
The GPIO module contains the data port (GPIO),
internal pull up resistors and the Output Latches
(OLAT).
Reading the GPIO register reads the value on the port.
Reading the OLAT register only reads the OLAT, not
the actual value on the port.
Writing to the GPIO register actually causes a write to
the OLAT. Writing to the OLAT register forces the
associated output drivers to drive to the level in OLAT.
Pins configured as inputs turn off the associated output
driver and put it in high-impedance.
1.6
Configuration and Control
Registers
The Configuration and Control blocks contain the
registers as shown in Table 1-3.
TABLE 1-3:
CONFIGURATION AND CONTROL REGISTERS
Register
Name
Address
(hex)
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
POR/RST
value
IODIR
IPOL
GPINTEN
DEFVAL
INTCON
IOCON
GPPU
INTF
INTCAP
GPIO
OLAT
* Not used on the MCP23008.
00
01
02
03
04
05
06
07
08
09
0A
IO7
IP7
IO6
IP6
IO5
IP5
IO4
IP4
IO3
IP3
IO2
IP2
IO1
IP1
IO0
IP0
1111 1111
0000 0000
GPINT7
DEF7
IOC7
PU7
INT7
ICP7
GP7
OL7
GPINT6
DEF6
IOC6
PU6
INT6
ICP6
GP6
OL6
GPINT5
DEF5
IOC5
SREAD
PU5
INT5
ICP5
GP5
OL5
GPINT4
DEF4
IOC4
DISSLW
PU4
INT4
ICP4
GP4
OL4
GPINT3
DEF3
IOC3
HAEN *
PU3
INT3
ICP3
GP3
OL3
GPINT2
DEF2
IOC2
ODR
PU2
INT2
ICP2
GP2
OL2
GPINT1
DEF1
IOC1
INTPOL
PU1
INT1
ICP1
GP1
OL1
GPINT0
DEF0
IOC0
PU0
INTO
ICP0
GP0
OL0
0000 0000
0000 0000
0000 0000
--00 000-
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
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