AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 413

• 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

32.6.1.3
The transmitter can also drive the TK I/O pad continuously or be limited to the actual data transfer. The clock out-
put is configured by the SSC_TCMR register. The Transmit Clock Inversion (CKI) bits have no effect on the clock
outputs. Programming the TCMR register to select TK pin (CKS field) and at the same time Continuous Transmit
Clock (CKO field) might lead to unpredictable results.
Figure 32-6. Transmitter Clock Management
The receiver clock is generated from the transmitter clock or the divider clock or an external clock scanned on the
RK I/O pad. The Receive Clock is selected by the CKS field in SSC_RCMR (Receive Clock Mode Register).
Receive Clocks can be inverted independently by the CKI bits in SSC_RCMR.
The receiver can also drive the RK I/O pad continuously or be limited to the actual data transfer. The clock output
is configured by the SSC_RCMR register. The Receive Clock Inversion (CKI) bits have no effect on the clock out-
puts. Programming the RCMR register to select RK pin (CKS field) and at the same time Continuous Receive
Clock (CKO field) can lead to unpredictable results.
Figure 32-7. Receiver Clock Management
Receiver Clock Management
Transmitter
Receiver
TK (pin)
RK (pin)
Divider
Divider
Clock
Clock
Clock
Clock
MUX
CKS
MUX
CKS
CKO
CKO
Controller
Tri_state
MUX
Controller
INV
CKI
Tri-state
MUX
INV
CKI
Data Transfer
Data Transfer
Controller
Tri-state
CKG
SAM7S Series [DATASHEET]
Controller
Tri-state
CKG
Clock
Output
Transmitter
Clock
6175M–ATARM–26-Oct-12
Receiver
Clock
Clock
Output
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