參數(shù)資料
型號(hào)： M44C092-V
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20
封裝： SSO-20
文件頁(yè)數(shù)： 16/80頁(yè)
文件大?。?/td> 609K
代理商： M44C092-V
M44C092–V
M44C092–V
Rev. A2, 08-Nov-01
23 (80)
3.2.2
Bidirectional Port 2
This, and all other bidirectional ports include a bitwise
programmable Control Register (P2CR), which enables
the individual programming of each port bit as input or
output. It also opens up the possibility of reading the pin
condition when in output mode. This is a useful feature
for self testing and for serial bus applications.
Port 2 however, has an increased drive capability and an
additional low resistance pull-up/-down transistor mask
option.
Master reset
Q
BP2y
Mask options
*
P2DATy
P2CRy
I/O Bus
D
I/O Bus
*
Switched
V
DD
*
Static
Pull-up
(Data out)
(Direction)
*
S
D
*
S
*
V
DD
Static
Pull-down
pull-down
pull-up
Figure 23. Bidirectional Port 2
Port 2 Data Register (P2DAT)
Primary register address: ’2’hex
Bit 3 *
Bit 2
Bit 1
Bit 0
P2DAT
P2DAT3
P2DAT2
P2DAT1
P2DAT0
Reset value: 1111b
* Bit 3 –> MSB, Bit 0 –> LSB
Port 2 Control Register (P2CR)
Auxiliary register address: ’2’hex
Bit 3
Bit 2
Bit 1
Bit 0
P2CR
P2CR3
P2CR2
P2CR1
P2CR0
Reset value: 1111b
Value: 1111b means all pins in input mode
Code
3 2 1 0
Function
x x x 1
BP20 in input mode
x x x 0
BP20 in output mode
x x 1 x
BP21 in input mode
x x 0 x
BP21 in output mode
x 1 x x
BP22 in input mode
x 0 x x
BP22 in output mode
1 x x x
BP23 in input mode
0 x x x
BP23 in output mode
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