參數(shù)資料
型號(hào): T48C893-TKQ
廠(chǎng)商: ATMEL CORP
元件分類(lèi): 微控制器/微處理器
英文描述: The multiple times programmable (MTP) version for the MARC4 ROM types
中文描述: 4-BIT, FLASH, 4 MHz, MICROCONTROLLER, PDSO20
封裝: SSO-20
文件頁(yè)數(shù): 24/82頁(yè)
文件大?。?/td> 638K
代理商: T48C893-TKQ
T48C893
Rev. A4, 22-Jan-02
24 (82)
4.2.2
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
Q
BP2y
Mask options
*
*
P2DATy
S
P2CRy
I/O Bus
D
I/O Bus
I/O Bus
*
*
Switched
pull-up
Switched
pull-down
VDD
*
Static
Pull-up
(Data out)
(Direction)
S
D
*
VDD
Static
Pull-down
Figure 23. Bidirectional Port 2
Port 2 Data Register (P2DAT)
Primary register address:
2
hex
Bit 3 *
Bit 2
Bit 1
P2DAT1
Bit 0
P2DAT0
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> LSB
P2DAT
Reset value: 1111b
Port 2 Control Register (P2CR)
Auxiliary register address:
2
hex
Bit 3
P2CR3
Bit 2
P2CR2
Bit 1
P2CR1
Bit 0
P2CR0
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Code
3 2 1 0
x x x 1
x x x 0
x x 1 x
P2CR
Reset value: 1111b
Function
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