Panasonic F77G User Manual page 209

The timer prescaler selection register selects the count clock that used in 8-bit timer.
Timer 0 Prescaler Selection Register (CK0MD)
7 6
CK0MD
Figure 5-2-2
Timer 1 prescaler selection register (CK1MD)
7 6
CK1MD
Figure 5-2-3
5 4 3 2
TM0PSC1 TM0PSC0
Timer 0 Prescaler Selection Register (CK0MD : x'03F56', R/W)
5 4 3 2
TM1PSC1 TM1PSC0
Timer 1 Prescaler Selection Register (CK1MD : x'03F57', R/W)
1 0
TM0BAS ( At reset : - - - - - X X X )
TM0PSC1 TM0PSC0
0
1
-
1 0
TM1BAS
( At reset : - - - - - X X X )
TM1PSC1 TM1PSC0
0
1
-
Chapter 5 Prescaler
TM0BAS Clock source selection
0
fosc/4
1
fosc/16
0
0 fosc/32
fosc/64
1
0 fs/2
1
1
fs/4
Clock source selection
TM1BAS
0
fosc/4
1
fosc/16
0
0 fosc/64
fosc/128
1
0 fs/2
1
1
fs/8
Control Registers
V - 7