AT83C26-RKRUL Atmel, AT83C26-RKRUL Datasheet - Page 11

• Manufacturer Part Number: AT83C26-RKRUL
• Description: RFID Modules & Development Tools 3V Smart card reader
• Manufacturer: Atmel

Address Byte
7511D–SCR–02/07
The first byte to send to the device is the address byte. The device controls if the hardware
address (A2/CK, A1/RST pins on reset) corresponds to the address given in the address byte
(A2, A1 bits).
If the level is not stable on A2/CK pin at reset, the user has to manage the possible address
taken by the device.
Up to 4 devices can be connected on the same TWI bus. Each device is configured with a differ-
ent combination on A2/CK, A1/RST pins. The address byte of each device for read/write
operations are listed below.
Table 2. Address Byte Values
Figure 1. Data transfer on TWI bus
Figure 2. Address Byte
(A2/CK pin)
A2
0
0
1
1
SDA
SCL
start condition
(A1/RST pin)
b7
0
Slave Address on 7 Bits
A1
0
1
0
1
1
b6
1
2
b5
0
Address byte
3
Address Byte
b4
0
Command
4
Read
0x4B
0x4F
0x47
0x43
for
A2
b3
5
6
b2
A1
1 for READ Command
0 for WRITE Command
7
b1
acknowledgement
from slave
Address Byte
1
8
Command
Write
0x4A
0x4E
0x42
0x46
R/W
b0
for
9
command
and/or data
stop condition
AT83C26
11