at91rm3400 ATMEL Corporation, at91rm3400 Datasheet - Page 316

• Manufacturer Part Number: at91rm3400
• Description: Atmel Advanced At91 Arm Microcontroller
• Manufacturer: ATMEL Corporation

Transmitter Clock
Management
Receiver Clock
Management
316
AT91RM3400
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 Inver-
sion (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 125. 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 trans-
fer. 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) might lead to
unpredictable results.
Figure 126. Receiver Clock Management
Transmitter Clock
Receiver Clock
Divider Clock
Divider Clock
TK
RK
SSC_TCMR.CKS
SSC_RCMR.CKS
0
1
0
1
SSC_TCMR.CKO
SSC_TCMR.CKI
SSC_RCMR.CKO
SSC_RCMR.CKI
Transmitter Clock
Receiver Clock
TK
RK
1790A–ATARM–11/03