AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 335

• Manufacturer Part Number: AT91SAM7S256D-AU
• Description: ARM Microcontrollers - MCU 256K Flash SRAM 64K ARM based MCU
• Manufacturer: Atmel
• Series: SAM7S256r

Specifications of AT91SAM7S256D-AU

• Rohs: yes
• Core: ARM
• Processor Series: AT91SAM
• Data Bus Width: 16 bit/32 bit
• Maximum Clock Frequency: 55 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 64 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 3 V to 3.6 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: LQFP-64
• Mounting Style: SMD/SMT
• Interface Type: 2-Wire, I2S, SPI, USART
• Length: 7 mm

Figure 30-20. Programmer Sends Data While the Bus is Busy
Figure 30-21. Arbitration Cases
Data from a Master
TWI DATA transfer
TWI DATA transfer
Data from TWI
(DADR + W + START + Write THR)
The flowchart shown in
mode.
(DADR + W + START + Write THR)
ARBLST
TWCK
A transfer is programmed
TWCK
TWD
TWD
A transfer is programmed
TWCK
TWD
Figure 30-22 on page 336
S
S
S
DATA sent by a master
1
1
1
Transfer is stopped
Bus is busy
0 0
0
0 0
1
STOP sent by the master
Transfer is kept
1 1
1 1
TWI stops sending data
Arbitration is lost
(DADR + W + START + Write THR)
Transfer is programmed again
Data from the master
Bus is busy
gives an example of read and write operations in Multi-master
Transfer is kept
Bus is free
Bus is considered as free
Transfer is initiated
P
P
Bus is free
Transfer is initiated
Bus is considered as free
START sent by the TWI
S
S
S
SAM7S Series [DATASHEET]
1
1
1
0
0 0
0
DATA sent by the TWI
1
0
The master stops sending data
1 1
Arbitration is lost
1 1
6175M–ATARM–26-Oct-12
Data from the TWI
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