AT85C5122D-RDRUM datasheet(52/208 Pages) ATMEL

52 / 208 page

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

Port 1

Port 1 has the following functions:

–

Default function : Only Port 1.2, P1.6 and P1.7 are standard I/O’s; the other

ports can be activated only with the SCIB function.

–

Alternate function and configuration: see Table 31.

Table 31.

Port 1 Description.

Port 2

Port 2 has the following functions:

–

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.

Port 2 has the following configurations:

–

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”

Port

Alternate Function

Configuration

Signal

Description

Mode

Comments

CIO

Smart card interface function

Card I/O

Quasi-bidirectional port supplied by

DC/DC converter

Low level at reset.

Caution

: if DPU bit is set in AUXR register, the

weak-pull of the port is disabled

CC8

Smart card interface function

Card contact 8

Quasi-bidirectional port supplied by

DC/DC converter

Low level at reset

Caution

: if DPU bit is set in AUXR register, the

weak-pull of the port is disabled

P1.2

CPRES

Smart card interface function

Card presence

Quasi-bidirectional port supplied by VCC

Weak & medium pull-up’s can be disconnected

by CPRESRES bit in PMOD0 regsiter

High Level at reset

CC4

Smart card interface function

Card contact 4

Quasi-bidirectional port supplied by

DC/DC converter

Low level at reset

Caution

: if DPU bit is set in AUXR register, the

weak-pull of the port is disabled

CCLK

Smart card interface function

Card clock

Push-Pull port supplied by DC/DC

converter

Low level at reset

CRST

Smart card interface function

Card reset

Push-Pull port supplied by DC/DC

converter

Low level at reset

P1.6

SS pin of the SPI function

Quasi-bidirectional supplied by VCC

P1.7

CCLK1

Alternate Card Clock output

Quasi-bidirectional supplied by VCC

Alternate Card Clock function disabled

Quasi-bidirectional supplied by VCC

Alternate Smart Card Clock enabled

Switched automatically to Push-pull (see Table

47 on page 80 )

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