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T83C5121 Datasheet(PDF) 9 Page - ATMEL Corporation

Part # T83C5121
Description  8-bit Microcontroller with Multiprotocol Smart Card Interface
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T83C5121 Datasheet(HTML) 9 Page - ATMEL Corporation

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9
A/T8xC5121
4164G–SCR–07/06
ONLY FOR PLCC52 version
P0[7:0]
AD[7:0]
VCC
I/O
Input/Output function Port 0
P0 is an 8-bit open-drain bi-directional I/O port. Port 0 pins that
have 1s written to them float and can be used as high impedance
inputs. To avoid any parasitic current consumption, Floating P0
inputs must be pulled to VCC or VSS.
I/O
Address/Data low
Mutiplexed Address/Data LSB for external access
P2[7:0]
A[15:8]
VCC
I/O
Input/Output function Port 2
P2 is an 8-bit open-drain bi-directional I/O port with internal pull-ups
O
Address high
Address Bus MSB for external access
P3.6
WR
DVCC
O
Write signal
Write signal asserted during external data memory write operation
P3.7
RD
DVCC
I
Read signal
Read signal asserted during external data memory read operation
ALE
VCC
O
Address latch enable output
The falling edge of ALE strobes the address into external latch
PSEN
PSEN
VCC
O
Program strobe enable
EA
EA
VCC
I
External access enable
This pin must be held low to force the device to fetch code from
external program memory starting at address 0000h. It is latched
during reset and cannot be dynamically changed during operation.
Table 1. Ports Description (Continued)
Port
Signal
Name
Alternate
Internal
Power
Supply
ESD
Type
Description


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