AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 352

• 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

30.10.6
Name:
Access:
Reset Value: 0x0000F009
• TXCOMP: Transmission Completed (automatically set / reset)
TXCOMP used in Master mode:
0 = During the length of the current frame.
1 = When both holding and shifter registers are empty and STOP condition has been sent.
TXCOMP behavior in Master mode can be seen in
TXCOMP used in Slave mode:
0 = As soon as a Start is detected.
1 = After a Stop or a Repeated Start + an address different from SADR is detected.
TXCOMP behavior in Slave mode can be seen in
page 343
• RXRDY: Receive Holding Register Ready (automatically set / reset)
0 = No character has been received since the last TWI_RHR read operation.
1 = A byte has been received in the TWI_RHR since the last read.
RXRDY behavior in Master mode can be seen in
RXRDY behavior in Slave mode can be seen in
page 343
• TXRDY: Transmit Holding Register Ready (automatically set / reset)
TXRDY used in Master mode:
0 = The transmit holding register has not been transferred into shift register. Set to 0 when writing into TWI_THR register.
1 = As soon as a data byte is transferred from TWI_THR to internal shifter or if a NACK error is detected, TXRDY is set at
the same time as TXCOMP and NACK. TXRDY is also set when MSEN is set (enable TWI).
TXRDY behavior in Master mode can be seen in
31
23
15
–
–
7
–
and
and
TWI Status Register
TWI_SR
Read-only
Figure 30-30 on page
Figure 30-30 on page
OVRE
30
22
14
–
–
6
GACC
343.
343.
29
21
13
–
–
5
Figure 30-8 on page
Figure 30-10 on page
Figure 30-25 on page
SVACC
Figure 30-27 on page
Figure 30-8 on page 324
28
20
12
–
–
4
EOSACC
SVREAD
27
19
11
–
–
3
324.
325.
339,
341,
and in
Figure 30-28 on page
Figure 30-28 on page
SCLWS
TXRDY
26
18
10
Figure 30-10 on page
–
–
2
SAM7S Series [DATASHEET]
ARBLST
RXRDY
6175M–ATARM–26-Oct-12
25
17
–
–
9
1
342,
342,
325.
Figure 30-29 on
Figure 30-29 on
TXCOMP
NACK
24
16
–
–
8
0
352