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: 21/78页
文件大小: 680K
代理商: MB90F457PMT
MB90455 Series
28
2.
Time-Base Timer
The time-base time is a 18-bit free-run counter (time-base timer counter) that counts up in synchronization with
the main clock (dividing main oscillation clock by 2).
Four choices of interval time are selectable, and generation of interrupt request is allowed for each interval time.
Provides operation clock signal to oscillation stabilizing wait timer and peripheral functions.
Interval timer function
When the counter of time-base timer reaches an interval time specified by interval time selection bit
(TBTC:TBC1, TBC0), an overflow (carrying-over) occurs (TBTC: TBOF=1) and interrupt request is generated.
If an interrupt by overflow is permitted (TBTC: TBIE=1), an interrupt is generated when overflow occurs (TBTC:
TBOF=1).
The following four interval time settings are selectable :
Interval time of time-base timer
HCLK: Oscillation clock
Values in parentheses “( )” are those under operation of 4-MHz oscillation clock.
Count clock
Interval time
2/HCLK (0.5
s)
212/HCLK (Approx. 1.0 ms)
214/HCLK (Approx. 4.1 ms)
216/HCLK (Approx. 16.4 ms)
219/HCLK (Approx. 131.1 ms)
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