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AT89C5122D-RDRUM 数据表(PDF) 53 Page - ATMEL Corporation

部件名 AT89C5122D-RDRUM
功能描述  C51 Microcontroller with USB and Smart Card Reader Interfaces
PDF  208 Pages
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制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

AT89C5122D-RDRUM 数据表(HTML) 53 Page - ATMEL Corporation

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AT83R5122, AT8xC5122/23
4202F–SCR–07/2008
Port 3
Port 3 has the following functions:
–
Default function: Port 3 is an 8-bit I/O port.
–
Alternate functions: see table below
Port 3 has the following configurations:
–
Default configuration: Pseudo bi-directional “Port51” digital input/output with
internal pull-ups.
–
Alternate configurations: See Table 32.
Table 32.
Port 3 Description
Port
Alternate Functions
Configurations
Signal
Description
Mode 1
Mode 2
Mode 3
Mode 4
P3.0
RxD
Receiver data input (asynchronous) or data input/output
(synchronous) of the serial interface
Push-pull
KB_OUT
Input WPU
P3.1
TxD
Transmitter data output (asynchronous) or clock output
(synchronous) of the serial interface
Push-pull
KB_OUT
Input WPU
P3.2
INT0
External interrupt 0 input/timer 0 gate control input
LED0
P3.3
INT1
External interrupt 1input/timer 1 gate control input
Push-pull
KB_OUT
Input WPU
P3.4
T0
Timer 0 counter input
Push-pull
KB_OUT
Input WPU
LED1
P3.5
T1
Timer 1 counter input
P3.6
WR
External Data Memory write strobe; latches the data byte
from port 0 into the external data memory
LED2
P3.7
RD
External Data Memory read strobe; Enables the external
data memory. Port 3 can drive CMOS inputs without external
pull-ups
LED3



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