参数资料
型号: MB90F457PMT
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP48
封装: 0.50 MM PITCH, PLASTIC, LQFP-48
文件页数: 32/78页
文件大小: 680K
代理商: MB90F457PMT
MB90455 Series
38
6.
Clock Timer Outline
The clock timer is a 15-bit free-run counter that increments in synchronization with sub clock.
Interval time is selectable among 7 choices, and generation of interrupt request is allowed for each interval.
Provides operation clock to the subclock oscillation stabilizing wait timer and watchdog timer.
Always uses subclock as a count clock regardless of settings of clock selection register (CKSCR).
Interval timer function
In the clock timer, a bit corresponding to the interval time overflows (carry-over) when an interval time, which
is specified by interval time selection bit, is reached. Then overflow flag bit is set (WTC: WTOF=1).
If an interrupt by overflow is permitted (WTC: WTIE=1), an interrupt request is generated upon setting an
overflow flag bit.
Interval time of clock timer is selectable among the following seven choices :
Interval time of clock timer
SCLK: Sub clock frequency
Values in parentheses “( )” are calculation when operating with 8.192 kHz clock.
Sub clock cycle
Interval time
SCLK (122
s)
28/SCLK (31.25 ms)
29/SCLK (62.5 ms)
210/SCLK (125 ms)
211/SCLK (250 ms)
212/SCLK (500 ms)
213/SCLK (1.0 s)
214/SCLK (2.0 s)
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