Fujitsu F2MC-8L Family series Hardware Manual page 60

HARDWARE CONFIGURATION
[Bits 1 and 0] PDS1 and PDS0:
Bits 1 and 0 are used to select the division of the divider at the front of the
baud rate generator.
PDS1 PDS0
0 0 Select 4 dividing
0 1 Select 6 dividing
1 0 Select 13 dividing
1 1 Select 65 dividing
2– 45
(Initial value)