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參數(shù)資料

型號(hào)：	MB90F428GPF
元件分類：	微控制器/微處理器
英文描述：	16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP100
封裝：	PLASTIC, QFP-100
文件頁(yè)數(shù)：	30/99頁(yè)
文件大小：	1714K
代理商：	MB90F428GPF

MB90420G/5G (A) Series

Watchdog Timer/Time Base Timer/Clock Timer

The watchdog timer, timer base timer, and clock timer have the following circuit configuration.

Watchdog timer : Watchdog counter, control register, watchdog reset circuit

Time base timer : 18-bit timer, interval interrupt control circuit

Clock timer

: 15-bit timer, interval interrupt control circuit

(1) Watchdog timer function

The watchdog timer is composed of a 2-bit watchdog counter that uses the carry signal from the 18-bit time

base timer or 15-bit clock timer as a clock source, plus a control register and watchdog reset control circuit.

After startup, this function will reset the CPU if not cleared within a given time.

(2) Time base timer function

The time base timer is an 18-bit free-run counter (time base counter) synchronized with the internal count clock

(base oscillator divided by 2) , with an interval timer function providing a selection of four interval times. Other

functions include a timer output for an oscillator stabilization wait time and clock feed to the watchdog timer or

other operating clocks. Note that the time base timer uses the main clock regardless of the setting of the MCS

bit or SCS bit in the CKSCR register.

(3) Clock timer function

The clock timer provides functions including a clock source for the watchdog timer, a sub clock base oscillator

stabilization wait timer, and an interval timer to generate an interrupt at fixed intervals. Note that the clock timer

uses the sub clock regardless of the setting of the MCS bit or SCS bit in the CKSCR register.

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