AT83C24B datasheet(8/42 Pages) ATMEL

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4234F–SCR–10/05

AT83C24

Write Commands

The write commands are:

Reset:

Initializes all the logic and the TWI interface as after a power-up or power-fail reset. If a

smart card is active when RESET falls, a deactivation sequence is performed. This is a one-

byte command.

Write Config:

Configures the device according to the last six bits in the CONFIG0 register and to the fol-

lowing four bytes in CONFIG1, CONFIG2, CONFIG3 then CONFIG4 registers. This is a

five bytes command.

Figure 3. Command byte format for Write CONFIG0 command

Write Timer:

Program the 16-bit automatic reset transition timer with the following two bytes. This is a

three bytes command.

Write Interface:

Program the interface. This is a one-byte command. The MSB of the command byte is fixed

at 0.

General Call Reset:

A general call followed by the value 06h has the same effect as a Reset command.

Table 3. Write Commands Description

Address Byte

(See Table 2)

Command Byte

Data Byte

1. Reset

0100 A

2A1A00

1111 1111

2. Write config

0100 A

2A1A00

(10 + CONFIG0 6

bits)

CONFIG1

CONFIG2

CONFIG3

CONFIG4

3. Write Timer

0100 A

2A1A00

1111 1100

TIMER1

TIMER0

4. Write Interface

0100 A

2A1A00

(0+INTERFACE 7

bits)

5. General Call

Reset

0000 0000

0000 0110

CONFIG0 on 6 Bits

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