參數(shù)資料
型號： μPD78F9177Y
廠商： NEC Corp.
英文描述： 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
中文描述： 8位單片機(jī)微控制器（8位單片微控制器）
文件頁數(shù)： 54/150頁
文件大小： 653K
代理商： ΜPD78F9177Y
Preliminary Product Information
52
μ
PD78F9177Y
(1) Clock timer
The 4.19-MHz main system clock or 32.768-kHz subsystem clock is used to issue an interrupt request
(INTWT) at 0.5-second intervals.
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 specified intervals.
Table 6-8. Interval Generated Using the Interval Timer
Interval
Operation at f
X
= 5.0 MHz
Operation at f
X
= 4.19 MHz
Operation at f
XT
= 32.768 kHz
2
4
×
1/f
W
409.6
μ
s
489
μ
s
488
μ
s
2
5
×
1/f
W
819.2
μ
s
978
μ
s
977
μ
s
2
6
×
1/f
W
1.64 ms
1.96 ms
1.95 ms
2
7
×
1/f
W
3.28 ms
3.91 ms
3.91 ms
2
8
×
1/f
W
6.55 ms
7.82 ms
7.81 ms
2
9
×
1/f
W
13.1 ms
15.6 ms
15.6 ms
Remark
f
W
: Clock timer clock frequency (f
X
/2
f
X
: Main system clock oscillation frequency
f
XT
: Subsystem clock oscillation frequency
7
or f
XT
)
6.5.2
Clock timer configuration
The clock timer consists of the following hardware.
Table 6-9. Clock Timer Configuration
Item
Configuration
Counter
5 bits
Prescaler
9 bits
Control register
Clock timer mode control register (WTM)
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