參數(shù)資料
型號: M38507F8FP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO42
封裝: 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-42
文件頁數(shù): 41/103頁
文件大?。?/td> 1275K
代理商: M38507F8FP
Rev.3.01
2003.06.20
page 40 of 97
3850 Group (Spec.H/A)
Fig. 37 Structure of PWM control register
Fig. 38 PWM output timing when PWM register or PWM prescaler is changed
sNote
The PWM starts after the PWM function enable bit is set to enable and “L” level is output from the PWM pin.
The length of this “L” level output is as follows:
sec
(Count source selection bit = 0, where n is the value set in the prescaler)
sec
(Count source selection bit = 1, where n is the value set in the prescaler)
n+1
2 f(XIN)
n+1
f(XIN)
PWM control register
(PWMCON : address 001D16)
PWM function enable bit
Count source selection bit
Not used (return “0” when read)
b7
b0
0: PWM disabled
1: PWM enabled
0: f(XIN) (f(XCIN) at low-speed mode)
1: f(XIN)/2 (f(XCIN)/2 at low-speed mode)
AB
C
B
T
C
T2
=
PWM output
PWM register
write signal
PWM prescaler
write signal
(Changes “H” term from “A” to “B”.)
(Changes PWM period from “T” to “T2”.)
When the contents of the PWM register or PWM prescaler have changed, the PWM
output will change from the next period after the change.
T
T2
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