AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 411

• 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 32-3. SSC Functional Block Diagram
32.6.1
The receiver and transmitter operate separately. However, they can work synchronously by programming the
receiver to use the transmit clock and/or to start a data transfer when transmission starts. Alternatively, this can be
done by programming the transmitter to use the receive clock and/or to start a data transfer when reception starts.
The transmitter and the receiver can be programmed to operate with the clock signals provided on either the TK or
RK pins. This allows the SSC to support many slave-mode data transfers. The maximum clock speed allowed on
the TK and RK pins is the master clock divided by 2.
The transmitter clock can be generated by:
The receiver clock can be generated by:
• an external clock received on the TK I/O pad
• the receiver clock
• the internal clock divider
• an external clock received on the RK I/O pad
• the transmitter clock
• the internal clock divider
Clock Management
APB
MCK
PDC
Interface
Divider
Clock
User
Interrupt Control
AIC
TF
RF
RF
RK Input
TX Clock
TF
TK Input
RX clock
Selector
Selector
Start
Start
TX PDC
RX PDC
Load Shift
Load Shift
Transmitter
Transmit Clock
Receive Clock
Controller
Controller
Receiver
Transmit Holding
Receive Holding
Register
Register
Transmit Shift Register
Receive Shift Register
RX Clock
TX clock
SAM7S Series [DATASHEET]
Holding Register
Holding Register
Transmit Sync
Receive Sync
Clock Output
Clock Output
Frame Sync
Frame Sync
Controller
Controller
Controller
Controller
6175M–ATARM–26-Oct-12
TK
RD
TD
RK
RF
TF
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