参数资料
型号: MB90F498GPFM
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP64
封装: PLASTIC, LQFP-64
文件页数: 38/90页
文件大小: 849K
代理商: MB90F498GPFM
MB90495G Series
43
6.
Clock Timer
The clock timer is a 15-bit free-run counter that counts up in synchronization with the subclock.
Seven different intervals can be selected, and interrupt requests generated for each interval time.
Supplies a timer for subclock oscillation stabilization standby, and an operational clock for the watchdog timer.
The subclock is always the count clock, regardless of the clock selection register (CKSCR) setting.
Interval timer feature
When the interval time set by the interval time selection bits (WTC : WTC2 to WTC0) is reached, the clock
timer generates an overflow in the bits corresponding to the interval time of the clock timer counter, and sets
the overflow flag bit (WTC : WTOF
= 1) .
Interrupts arising from overflows are enabled (WTC : WTIE
= 1) , an interrupt request is generated when the
overflow flag bit is set (WTC : WTOF
= 1) .
Select from one of the following 7 clock timer intervals :
Clock Timer Interval Times
SCLK : Subclock frequency
Figures in parentheses ( ) are a sample calculation with the subclock running at 8.192 kHz.
Subclock Frequency
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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