at83c5122 ATMEL Corporation, at83c5122 Datasheet - Page 55
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at83c5122
Manufacturer Part Number
at83c5122
Description
At83c5123 C51 Microcontroller With Usb And Smart Card Reader Interfaces
Manufacturer
ATMEL Corporation
Datasheet
1.AT83C5122.pdf
(213 pages)
- Current page: 55 of 213
- Download datasheet (3Mb)
Port 3
4202E–SCR–06/06
Port
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
Alternate Functions
Signal
RxD
TxD
INT0
INT1
T0
T1
WR
RD
Description
Receiver data input (asynchronous) or data input/output
(synchronous) of the serial interface
Transmitter data output (asynchronous) or clock output
(synchronous) of the serial interface
External interrupt 0 input/timer 0 gate control input
External interrupt 1input/timer 1 gate control input
Timer 0 counter input
Timer 1 counter input
External Data Memory write strobe; latches the data byte
from port 0 into the external data memory
External Data Memory read strobe; Enables the external
data memory. Port 3 can drive CMOS inputs without external
pull-ups
Port 3 has the following functions:
Port 3 has the following configurations:
Table 32. Port 3 Description
–
–
–
–
Default function: Port 3 is an 8-bit I/O port.
Alternate functions: see table below
Default configuration: Pseudo bi-directional “Port51” digital input/output with
internal pull-ups.
Alternate configurations: See Table 32.
Configurations
Push-pull
Push-pull
Push-pull
Push-pull
Mode 1
KB_OUT
KB_OUT
KB_OUT
KB_OUT
Mode 2
AT8xC5122/23
Input WPU
Input WPU
Input WPU
Input WPU
Mode 3
Mode 4
LED0
LED1
LED2
LED3
55
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