SAM3A4C Atmel Corporation, SAM3A4C Datasheet - Page 600
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SAM3A4C
Manufacturer Part Number
SAM3A4C
Description
Manufacturer
Atmel Corporation
- Current page: 600 of 1465
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30.7.1.4
30.7.2
600
600
SAM3X/A
SAM3X/A
Transmitter Operations
Serial Clock Ratio Considerations
Figure 30-7. Receiver Clock Management
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. In
this case, the maximum clock speed allowed on the RK pin is:
In addition, the maximum clock speed allowed on the TK pin is:
A transmitted frame is triggered by a start event and can be followed by synchronization data
before data transmission.
The start event is configured by setting the Transmit Clock Mode Register (SSC_TCMR).
“Start” on page 602.
The frame synchronization is configured setting the Transmit Frame Mode Register
(SSC_TFMR).
To transmit data, the transmitter uses a shift register clocked by the transmitter clock signal and
the start mode selected in the SSC_TCMR. Data is written by the application to the SSC_THR
register then transferred to the shift register according to the data format selected.
When both the SSC_THR and the transmit shift register are empty, the status flag TXEMPTY is
set in SSC_SR. When the Transmit Holding register is transferred in the Transmit shift register,
the status flag TXRDY is set in SSC_SR and additional data can be loaded in the holding
register.
– Master Clock divided by 2 if Receiver Frame Synchro is input
– Master Clock divided by 3 if Receiver Frame Synchro is output
– Master Clock divided by 6 if Transmit Frame Synchro is input
– Master Clock divided by 2 if Transmit Frame Synchro is output
Transmitter
RK (pin)
Divider
Clock
Clock
See “Frame Sync” on page 604.
MUX
CKS
CKO
Controller
Tri-state
MUX
CKI
INV
Data Transfer
Controller
Tri-state
CKG
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
Clock
Output
Receiver
Clock
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