參數(shù)資料
型號(hào): MB90457SPMT
廠商: FUJITSU LTD
元件分類: 微控制器/微處理器
英文描述: 16-bit Proprietary Microcontroller
中文描述: 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP48
封裝: 7 X 7 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, PLASTIC, LQFP-48
文件頁(yè)數(shù): 28/78頁(yè)
文件大小: 680K
代理商: MB90457SPMT
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
μ
s)
2
12
/HCLK (Approx. 1.0 ms)
2
14
/HCLK (Approx. 4.1 ms)
2
16
/HCLK (Approx. 16.4 ms)
2
19
/HCLK (Approx. 131.1 ms)
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