Fujitsu F2MC-8FX Hardware Manual page 171

Function of Clock Supply
The clock supply function of the timebase timer provides the timer output for generating the main clock
oscillation stabilization wait time and supplies the operating clock to the watchdog timer and to the
prescaler used by some peripheral functions.
When timebase timer output is stopped, the clock supplied by timebase timer is stopped.
Table 10.1-2 shows the cycle supplied from the timebase timer.
Table 10.1-2 Clock Signal Supplied from the Timebase Timer
Destination of Supply Clock
Oscillation stabilization wait time of
main clock
Oscillation stabilization wait time of
main PLL clock
Watchdog timer
Prescaler
LCD controller
F : Main source oscillation clock
CH
The values in parentheses represent the values used when the main clock operates at 4MHz.
Clock Cycle
13
2 x 2/F (4.10 ms)
CH
to
(0.5 μs)
2/F
CH
10 (512.0 μs)
2 x 2/F
CH
20
2 x 2/F (524.29 ms)
CH
19
2 x 2/F (262.14 ms)
CH
7 (64.0 μs)
2 x 2/F
CH
6 (32.0 μs)
2 x 2/F
CH
18
2 x 2/F (131.07 ms)
CH
to
15
2 x 2/F (16.38 ms)
CH
CHAPTER 10 TIMEBASE TIMER
Remark
Set by oscillation stabilization wait time setting register
(WATR)
The time between 2 count (Min) and 3 count (Max) for
10
2 x 2/F is the stabilization standby time.
CH
Count clock for watchdog timer
Operationg clock of prescaler used by peripheral
function
Oeration clock which LCD controller operates
157