參數(shù)資料
型號: GMS87C2020LQ
廠商: Electronic Theatre Controls, Inc.
英文描述: CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver
中文描述: CMOS單芯片8位微控制器與A / D轉(zhuǎn)換器
文件頁數(shù): 62/107頁
文件大小: 1482K
代理商: GMS87C2020LQ
HMS81C2012A/2020A
58
SEP. 2004 Ver 2.00
Figure 12-13 Example of PWM at 4MHz
Figure 12-14 Example of Changing the Period in Absolute Duty Cycle (@4MHz)
Source
clock
T1
PWM1O
[POL=1]
~
~
02
03
04
05
7F
80
81
02
03
~
~
~
~
~
~
PWM1O
[POL=0]
Duty Cycle [ 80H x 250nS = 32uS ]
Period Cycle [ 3FFH x 250nS = 255.75uS, 3.9KHz ]
PWM1HR = 0CH
T1PPR = FFH
T1PDR = 80H
T1CK[1:0] = 00 ( f
XI
)
PWM1HR3 PWM1HR2
PWM1HR1 PWM1HR0
T1PPR (8-bit)
T1PDR (8-bit)
Period
Duty
1
1
FFH
0
0
80H
01
00
PWM1E
~
T1ST
~
T1CN
~
01
00
3FF
Source
clock
T1
PWM1O
POL=1
Duty Cycle
[ 05H x 2uS = 10uS ]
Period Cycle [ 0EH x 2uS = 28uS, 35.5KHz ]
PWM1HR = 00H
T1PPR = 0EH
T1PDR = 05H
T1CK[1:0] = 10 ( 1uS )
02
03
04
05
06
08
09
0B 0C 0D
0E
01 02
03
04
05
06 07
08
09
0A
01 02
03 04
07
0A
05
Duty Cycle
[ 05H x 2uS = 10uS ]
Period Cycle [ 0AH x 2uS = 20uS, 50KHz ]
Duty Cycle
[ 05H x 2uS = 10uS ]
Write T1PPR to 0AH
Period changed
01
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