AT94K05AL-25BQX Atmel, AT94K05AL-25BQX Datasheet - Page 141

• Manufacturer Part Number: AT94K05AL-25BQX
• Manufacturer: Atmel

Specifications of AT94K05AL-25BQX

• Device System Gates: 5000
• Propagation Delay Time: 12.1ns
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (min): 3V
• Operating Temperature Classification: Commercial
• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Mounting: Surface Mount
• Pin Count: 144
• Package Type: LQFP
• Lead Free Status / RoHS Status: Compliant

1138I–FPSLI–1/08
Figure 4-47. Block diagram of the 2-wire Serial Bus Interface
The CPU interfaces with the 2-wire Serial Interface via the following five I/O registers: the 2-wire
Serial Bit-rate Register (TWBR), the 2-wire Serial Control Register (TWCR), the 2-wire Serial
Status Register (TWSR), the 2-wire Serial Data Register (TWDR), and the 2-wire Serial Address
Register (TWAR, used in Slave mode).
The 2-wire Serial Bit-rate Register – TWBR
Bit
$1C ($3C)
Read/Write
Initial Value
SDA
SCL
7
TWBR7
R/W
0
OUTPUT
OUTPUT
INPUT
INPUT
6
TWBR6
R/W
0
5
TWBR5
R/W
0
TWAR
ADDRESS REGISTER
TWDR
STATUS DECODER
STATE MACHINE
SERIAL CLOCK
COMPARATOR
ARBITRATION
START/STOP
GENERATOR
DATA SHIFT
AND SYNC
REGISTER
4
TWBR4
R/W
0
STATUS
AND
AND
AT94KAL Series FPSLIC
3
TWBR3
R/W
0
2
TWBR2
R/W
0
TWCR
TWSR
REGISTER
REGISTER
CONTROL
CONTROL
STATUS
TIMING
AND
ACK
1
TWBR1
R/W
0
0
TWBR0
R/W
0
TWBR
141