Table 10-12 SMR and SCR3 Settings and Clock Source Selection
SMR SCR3
bit 7 bit 1 bit 0
Transmit/Receive Clock
COM CKE1 CKE0 Mode
Clock Source SCK3X Pin Function
0
0
0
1
1
0
1
1
0
0
1
0
1
1
0
1
0
1
0
0
0
1
1
1
Asynchronous Internal
mode
I/O port (SCK3X pin not used)
Outputs clock with same frequency as bit rate
Outputs clock with frequency 16 times bit rate
Outputs serial clock
External
Synchronous Internal
mode
External
Inputs serial clock
Reserved (Do not specify these combinations)
292