Rainbow Electronics AT83C24NDS - Manual (Page 8)

8
4234F–SCR–10/05
AT83C24
Write Commands The write commands are:
1. 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.
2. 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
3. Write Timer:
Program the 16-bit automatic reset transition timer with the following two bytes. This is a
three bytes command.
4. Write Interface:
Program the interface. This is a one-byte command. The MSB of the command byte is fixed
at 0.
5. 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 Data Byte
2 Data Byte
3 Data Byte
4
1. Reset 0100 A
2
A
1
A
0
0 1111 1111
2. Write config
0100 A
2
A
1
A
0
0
(10 + CONFIG0 6
bits)
CONFIG1 CONFIG2 CONFIG3 CONFIG4
3. Write Timer 0100 A
2
A
1
A
0
0 1111 1100 TIMER1 TIMER0
4. Write Interface
0100 A
2
A
1
A
0
0
(0+INTERFACE 7
bits)
5. General Call
Reset
0000 0000 0000 0110
b7 b6 b5 b4 b3 b2 b1
1 X 0 X X X X
CONFIG0 on 6 Bits
b0
X