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參數(shù)資料
| 型號(hào)： | MB90MF408PF |
| 廠商： | FUJITSU LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-Bit Original Microcontroller |
| 中文描述： | 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | 0.65 MM PITCH, PLASTIC, QFP-100 |
| 文件頁數(shù)： | 26/64頁 |
| 文件大?。?/td> | 310K |
| 代理商： | MB90MF408PF |
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MB90M405 Series
26
3.
Timebase Timer
The timebase timer is a 18-bit free-run counter that counts up in synchronization with the main clock. The timer
has an interval timer function capable of setting four different intervals, and a function for supplying clocks to the
oscillator stabilization standby timer, watchdog timer, and time clock output circuit.
Interval timer function
The interval timer function sends an interrupt request at set intervals.
When the timebase timer counter’s interval timer counter overflows, an interrupt request is output.
One of four intervals can be set for the interval timer.
HCLK : Oscillator clock frequency
Values in parentheses ( ) are when oscillator clock frequency is 4 MHz.
Clock Supply Function
The clock supply function supplies operation clocks to the oscillation stabilization standby timer and some
peripheral functions.
HCLK : Oscillator clock frequency
Values in parentheses ( ) are when oscillator clock frequency is 4 MHz.
Reference : Immediately after oscillation begins, the oscillation cycles are unstable; oscillation stabilization standby
is a rough measure of the time for oscillation to become stable.
Main Clock Cycle
Interval Times
2/HCLK (0.5
μ
s)
2
12
/HCLK (Approx. 1.02 ms)
2
14
/HCLK (Approx. 4.09 ms)
2
16
/HCLK (Approx. 16.38 ms)
2
19
/HCLK (Approx. 131.1 ms)
Clock Supply Destination
Clock Cycles
Remarks
Oscillation stabilization standby
2
13
/HCLK (Approx. 2.05 ms)
Oscillation stabilization standby for ce-
ramic oscillator
2
15
/HCLK (Approx. 8.2 ms)
Oscillation stabilization standby for
crystal oscillator
2
18
/HCLK (Approx. 65.53 ms)
Watchdog timer
2
12
/HCLK (Approx. 1.02 ms)
Count-up clock for watchdog timer
2
14
/HCLK (Approx. 4.1 ms)
2
16
/HCLK (Approx. 16.38 ms)
2
19
/HCLK (Approx. 131.07 ms)
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