参数资料
型号: mPD789322
厂商: NEC Corp.
元件分类: 8位微控制器
英文描述: 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
中文描述: 8位微控制器与2/4/8K字节在系统可编程闪存
文件页数: 37/96页
文件大小: 482K
代理商: MPD789322
Preliminary Product Information U14673EJ1V0PM00
42
PD789322,789324,789326,789327
(1) Watch timer
An interrupt request (INTWT) is generated at 0.5-second intervals using the 4.19-MHz main system clock or
32.768-kHz subsystem clock.
Caution
When the main system clock is operating at 5.0 MHz, it cannot be used to generate a 0.5-second
interval.
In this case, the subsystem clock, which operates at 32.768 kHz, should be used
instead.
(2) Interval timer
The interval timer is used to generate an interrupt request (INTWTI) at preset intervals.
Table 5-7. Interval Time of Interval Timer
Interval Time
At fX = 5.0 MHz Operation
At fX = 4.19 MHz Operation
At fXT = 32.768 kHz Operation
2
4 × 1/fW
409.6
s
488
s
488
s
2
5 × 1/fW
819.2
s
977
s
977
s
2
6 × 1/fW
1.64 ms
1.95 ms
2
7 × 1/fW
3.28 ms
3.91 ms
2
8 × 1/fW
6.55 ms
7.81 ms
2
9 × 1/fW
13.1 ms
15.6 ms
Remarks 1. fW: Watch timer clock frequency (fX/2
7 or fXT)
2. fX: Main system clock oscillation frequency
3. fXT: Subsystem clock oscillation frequency
5.4.2 Watch timer configuration
The watch timer consists of the following hardware.
Table 5-8. Watch Timer Configuration
Item
Configuration
Counter
5 bits
× 1
Prescaler
9 bits
× 1
Control register
Watch timer mode control register (WTM)
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