User`s manual

CONTROL REGISTERS S3F84A5_UM_REV1.10
4-8
CLKCON — System Clock Control Register D4H Set 1
Bit Identifier .7 .6 .5 .4 .3 .2 .1 .0
RESET Value
– – – 0 0 – – –
Read/Write
– – – R/W R/W – – –
.7-.5 Not used for the S3F84A5
.4-.3
CPU Clock (System Clock) Selection Bits
(note)
0 0 fxx/16
0 1 fxx/8
1 0 fxx/2
1 1 fxx/1 (non-divided)
.2-.0 Not used for the S3F84A5
NOTE: After a reset, the slowest clock (divided by 16) is selected as the system clock. To select faster clock speeds, load
the appropriate values to CLKCON.3 and CLKCON.4.