AT89EVK-01 Atmel, AT89EVK-01 Datasheet - Page 11

• Manufacturer Part Number: AT89EVK-01
• Description: KIT EVAL FOR AT83C24 FOR TDA8004
• Manufacturer: Atmel

Specifications of AT89EVK-01

• Main Purpose: Memory, Smart Card
• Utilized Ic / Part: AT83C24
• Processor To Be Evaluated: AT83C24
• Interface Type: RS-232
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

3.1
3.1.1
3.1.2
3.1.3
AT89EVK-01 User Guide
AT83C24
Description
Overview
TWI Address
AT83C24 Registers
The AT83C24 is a smart card reader IC. A TWI bus is used to configure the AT83C24.
On the AT89EVK-01 board, the T89C5121 controls theTWI link.
After a reset, the T89C5121 sends commands to write values in AT83C24 registers.
The address byte is sampled on A2, A1, A0 after each reset. The address is then:
The level on A2, A1 and A0 are not stable on all applications. To avoid any problem, the
software sends each command to all addresses. One command is transformed in 8
commands.
The AT83C24 has 11 registers:
CONFIG0, CONFIG1, CONFIG2, CONFIG3, CONFIG4, INTERFACE, STATUS
TIMER1, TIMER0, CAPTURE0, CAPTURE1.
Several commands are used to write in AT83C24 registers.
A2
0
0
0
0
1
1
1
1
A1
0
0
1
1
0
0
1
1
Software Description
A0
0
1
0
1
0
1
0
1
Address Byte
Command
Read
0x4B
0x4D
0x4F
0x41
0x43
0x45
0x47
0x49
for
Section 3
Address Byte
Command
4325C–SCR–09/04
Write
0x4C
0x40
0x42
0x44
0x46
0x48
0x4A
0x4E
for
3-13