Atmel Evaluation Kit AT91SAM9G25-EK AT91SAM9G25-EK Data Sheet
Product codes
AT91SAM9G25-EK
954
SAM9G25 [DATASHEET]
11032D–ATARM–10-Mar-2014
43.7.1.2 Transmitter Clock Management
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.
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.
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 43-6. Transmitter Clock Management
43.7.1.3 Receiver 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.
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.
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
CKS
CKO
Data Transfer
CKI
CKG
Transmitter
Clock
Clock
Clock
Output
Output
MUX
Tri_state
Controller
Tri-state
Controller
INV
MUX