Rainbow-electronics AT83C21GC Manual de usuario descargar pdf (Pagina 4)

4247CS–SCR–11/05

AT83C21GC

Pin Description Figure 2. 24-pin SSOP Pinout

P1.1/CC8

P1.4/CCLK

P1.0/CIO

RST

P1.5/CRST

P1.3/CC4

P1.2/CPRES

XTAL1

P3.3/INT1/OE

P3.2/INT0

P3.4/T0

P3.5/CIO1/T1

CVSS

VSS

P3.0/RxD

P3.1/TxD

P3.6/CCLK1/LED0

XTAL2

P3.7/CRST1/LED1

SSOP24

Table 1. Port Signal Description

Port

Signal

Name

Internal

Power

Supply ESD Type Description

P1.0 CIO CV

4 kV I/O

Smart Card Interface Function

Card I/O – Pull-up medium is lower than 20KΩ

P1.1 CC8 CV

4 kV I/O

Smart Card Interface Function

Card contact 8 – Pull-up medium must be less than 20KΩ

P1.2 CPRES V

4 kV I

Smart Card Interface Function

Card presence

P1.3 CC4 CV

4 kV I/O

Smart Card Interface Function

Card contact 4 – Pull-up medium must be less than 20KΩ

P1.4 CCLK CV

4 kV O

Smart Card Interface Function

Card clock

P1.5 CRST CV

4 kV O

Smart Card Interface Function

Card reset – Pull-up medium must be less than 20KΩ

P3.0 RxD EV

UART Function

Receive data input

P3.1 TxD EV

UART Function

Transmit data output.

P3.2 INT0 DV

I/O

Input/Output Function

P3.2 is a bi-directional I/O port with internal pull-ups.

P3.3 INT1 EV

I/O

Input/Output Function

P3.3 is a bi-directional I/O port with internal pull-ups.

P3.4 EV

I/O

Input/Output Function

P3.4 is a bi-directional I/O port with internal pull-ups.

P3.5 CIO1 DV

I/O

Alternate Card Function

Card I/O: Pull-up medium must be less than 20K

1 2 3 4 5 6

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