Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet

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SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

The transmitter clock is generated from the receiver clock or the divider clock or an external clock scanned on the 

TK I/O pad. The transmitter clock is selected by the CKS field in SSC_TCMR (Transmit Clock Mode Register). 

Transmit Clock can be inverted independently by the CKI bits in SSC_TCMR.
The transmitter can also drive the TK I/O pad continuously or be limited to the actual data transfer. The clock 

output 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.

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 

outputs. 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.

TK (pin)

Receiver

Clock

Divider

Clock

MUX

Tri_state

Controller

Clock 
Output

CKO

Data Transfer

CKS

INV

MUX

Tri_state

Controller

Transmitter
Clock

CKI

CKG