TDA8005G datasheet(13/32 Pages) PHILIPS

13 / 32 page

1996 Sep 25

Philips Semiconductors

Product speciﬁcation

Low-power smart card coupler

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

Notes

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

2. The character will be in the accumulator.

CHANGE OF CLOCK CONFIGURATION(1)

READ CHARACTER ARRIVED IN UART RECEIVE(2)

CLR REG0

CLR REG1

CLR R/W

SET R/W

MOV R2, #8

CLR ENABLE

LOOP

RRC A

SET ENABLE

MOV DATA C

CLR ENABLE

CLR STROBE

SET ENABLE

SET STROBE

MOV R2, #8

DJNZ R2, LOOP

LOOP

MOV C, DATA

CLR ENABLE

RRC A

SET ENABLE

CLR STROBE

SET DATA

SET STROBE

RET

DJNZ R2, LOOP

SET DATA

RET

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