AT83EC5123 ATMEL Corporation, AT83EC5123 Datasheet - Page 11

• Manufacturer Part Number: AT83EC5123
• Description: (AT8xx512x) Smart Card Reader ICs
• Manufacturer: ATMEL Corporation

Port 2
Port 3
4202B–SCR–07/03
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
Note:
Port 2 has the following functions:
Port 2 has the following configurations:
Port 3 has the following functions:
Port 3 has the following configurations:
Table 4. Port 3 description
P1.7
–
–
–
–
–
–
–
–
–
–
P1.7 is switched automatically to Push-pull when the alternate clock is selected (see
Table 42 on page 48 )
Default function: Port 2 is an 8-bit I/O port.
Alternate function 1: Port 2 is also the multiplexed high-order address during
accesses to external Program and Data Memory. In this application, it uses
strong internal pull-ups when emitting 1’s and it can drive CMOS inputs
without external pull-ups.
Default configuration: Pseudo bi-directional “Port51” digital input/output with
internal pull-ups.
Configuration 1: Push-pull output
Configuration 2: Low speed output, “KB_OUT
Configuration 3: Input with weak pull-up, “WPU input”
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 4.
CCLK1
Alternate smart card clock output
Configurations
Push-pull
Push-pull
Push-pull
Push-pull
Mode 1
Port51/P
ush-pull
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
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