Panasonic F77G User Manual page 211

The serial interface transfer clock selection register (SCnCKS) selects the transfer clock used for serial
data transfer.
Serial Interface 0 Transfer Clock Selection Register (SC0CKS)
7 6
SC0CKS
Figure 5-2-6 Serial Interface 0 Transfer Clock Selection Register (SC0CKS : x'03F97', R/W)
Serial Interface 1 Transfer Clock Selection Register (SC1CKS)
7 6
SC1CKS
Figure 5-2-7 Serial Interface 1 Transfer Clock Selection Register (SC1CKS : x'03F9F', R/W)
5 4 3 2
Reserved
SC0PSC2 SC0PSC1 SC0PSC0
5 4 3 2
Reserved SC1PSC2 SC1PSC1 SC1PSC0
1 0
( At reset : - - - - 0 X X X )
SC0PSC2 SC0PSC1
0
1
Reserved
1 0
( At reset : - - - - 0 X X X )
SC1PSC2 SC1PSC1
0
1
Reserved
Chapter 5 Prescaler
SC0PSC0
Clock source selection
0 fosc/2
0
1 fosc/4
fosc/16
0
1
fosc/64
1
fs/2
0
0
1 fs/4
1 X Timer 5 output
Set always to "0"
Clock source selection
SC1PSC0
0 fosc/2
0
1
fosc/4
fosc/16
0
1
fosc/64
1
fs/2
0
0
1 fs/4
1 X Timer 4 output
Set always to "0"
Control Registers
V - 9