TDA8005G 查看數據表（PDF） - Philips Electronics

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TDA8005G

Low-power smart card coupler

Philips Electronics 

Philips Semiconductors

Low-power smart card coupler

Product specification

TDA8005

USE OF PERIPHERAL INTERFACE

Write operation:

Select the correct register with R/W, REG0, REG1.

Write the word in the peripheral shift register (PSR) with

DATA and STROBE. DATA is shifted on the rising edge

of STROBE. 8 shifts are necessary.

Give a negative pulse on ENABLE. The data is parallel

loaded in the register on the falling edge of ENABLE.

Read operation:

Select the correct register with R/W, REG0 and REG1.

Give a first negative pulse on ENABLE. The word is

parallel loaded in the peripheral shift register on the

rising edge of ENABLE.

Give a second negative pulse on ENABLE for

configuring the PSR in shift right mode.

Read the word from PSR with DATA and STROBE.

DATA is shifted on the rising edge of STROBE. 7 shifts

are necessary.

Table 3 Example of peripheral interface

CHANGE OF CLOCK CONFIGURATION(1)

LOOP

CLR REG0

CLR REG1

CLR R/W

MOV R2, #8

RRC A

MOV DATA C

CLR STROBE

SET STROBE

DJNZ R2, LOOP

CLR ENABLE

SET ENABLE

SET DATA

RET

READ CHARACTER ARRIVED IN UART RECEIVE(2)

CLR REG0

CLR REG1

SET R/W

CLR ENABLE

SET ENABLE

CLR ENABLE

SET ENABLE

MOV R2, #8

LOOP

MOV C, DATA

RRC A

CLR STROBE

SET STROBE

DJNZ R2, LOOP

SET DATA

RET

Notes

1. The new configuration is supposed to be in the accumulator.

2. The character will be in the accumulator.

1996 Sep 25

13

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