FUJITSU Semiconductor Controller MB89950/950A - Manual (Page 115)

101
CHAPTER 5 TIMEBASE TIMER
■ Clock supply function
The clock supply function provides the timer output used for the main clock oscillation stabilization delay
time (two values), and operation clock for some peripheral functions.
Table 5.1-2 "Clocks supplied by timebase timer" lists the cycles of the clocks that the timebase timer
supplies to various peripherals.
Reference:
The oscillation stabilization delay time should be used as a guide line since the oscillation cycle is
unstable immediately after oscillation starts.
Table 5.1-2 Clocks supplied by timebase timer
Clock destination Clock cycle Remarks
Main clock oscillation
stabilization delay time
2
14
/F
CH
(approx. 3.28 ms)
Selected by mask option
2
18
/F
CH
(approx. 52.43 ms)
Noise-filter circuit in
PWC timer
2
2
/F
CH
(approx. 0.8
µs)
Select by noise filter control register 2
5
/F
CH
(approx. 6.4
µs)
2
7
/F
CH
(approx. 25.6
µs)
Watchdog timer 2
21
/F
CH
(approx. 419.43 ms)
Count-up clock for the watchdog timer
LCD controller/driver 2
6
/F
CH
(approx. 12.8
µs) Frame cycle clock
F
CH
: Main clock oscillation frequency
The values enclosed in parentheses ( ) are for a 5 MHz main clock oscillation frequency.