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型號(hào)：	UPD780076
廠商：	NEC Corp.
元件分類：	8位微控制器
英文描述：	8-Bit Single-Chip Microcontrollers
中文描述：	8位單芯片微控制器
文件頁(yè)數(shù)：	219/592頁(yè)
文件大?。?/td>	3307K
代理商：	UPD780076

CHAPTER 11 WATCHDOG TIMER

s Manual U14260EJ3V1UD

11.4.2 Interval timer operation

The watchdog timer operates as an interval timer that generates interrupt requests repeatedly at an interval of the

preset count value when bit 4 (WDTM4) of the watchdog timer mode register (WDTM) is set to 0.

The interval time of the interval timer is selected with bits 0 to 2 (WDCS0 to WDCS2) of the watchdog timer clock

select register (WDCS). When bit 7 (RUN) of WDTM is set to 1, the watchdog timer operates as an interval timer.

When the watchdog timer operates as an interval timer, the interrupt mask flag (WDTMK) and priority specification

flag (WDTPR) are validated and the maskable interrupt request (INTWDT) can be generated. Among the maskable

interrupts, INTWDT has the highest priority at default.

The interval timer continues operating in the HALT mode but it stops in STOP mode. Thus, set RUN to 1 before

the STOP mode is set, clear the interval timer and then execute the STOP instruction.

Cautions 1. Once bit 4 (WDTM4) of WDTM is set to 1 (this selects the watchdog timer mode), the interval

timer mode is not set unless RESET is input.

2. The interval time just after setting WDTM may be shorter than the set time by up to 2

3. When the subsystem clock is selected for the CPU clock, the watchdog timer count operation

Table 11-3. Interval Timer Interval Time

Interval Time

When Operated at

When Operated at

Expanded-specification products of

PD780078 Subseries only.

: Main system clock oscillation frequency

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
UPD780101MC-047-5A4-E1-A	制造商:Renesas Electronics Corporation 功能描述:
UPD780102MC-082-5A4-A	制造商:Renesas Electronics Corporation 功能描述:
UPD780102MC-083-5A4-A	制造商:Renesas Electronics Corporation 功能描述:
UPD780134GK-424-9ET-E3-A	制造商:Renesas Electronics Corporation 功能描述:
UPD78014GC-765-AB8	制造商:NEC Electronics Corporation 功能描述:

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