HMS81C2012A Datasheet, PDF (62/107 Pages) List of Unclassifed Manufacturers – CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver

HMS81C2012A/2020A
Source
clock
T1
PWM1E
T1ST
T1CN
PWM1O
[POL=1]
PWM1O
[POL=0]
00 01 02
03
04
05
7F
80
81
Duty Cycle [ 80H x 250nS = 32uS ]
Period Cycle [ 3FFH x 250nS = 255.75uS, 3.9KHz ]
3FF 00 01 02
03
T1CK[1:0] = 00 ( fXI )
PWM1HR = 0CH
T1PPR = FFH
T1PDR = 80H
Period PWM1HR3 PWM1HR2
1
1
Duty
PWM1HR1 PWM1HR0
0
0
T1PPR (8-bit)
FFH
T1PDR (8-bit)
80H
Figure 12-13 Example of PWM at 4MHz
T1CK[1:0] = 10 ( 1uS )
PWM1HR = 00H
T1PPR = 0EH
T1PDR = 05H
Write T1PPR to 0AH
Period changed
Source
clock
T1
01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 01 02 03 04 05 06 07 08 09 0A 01 02 03 04 05
PWM1O
POL=1
Duty Cycle
[ 05H x 2uS = 10uS ]
Period Cycle [ 0EH x 2uS = 28uS, 35.5KHz ]
Duty Cycle
[ 05H x 2uS = 10uS ]
Duty Cycle
[ 05H x 2uS = 10uS ]
Period Cycle [ 0AH x 2uS = 20uS, 50KHz ]
Figure 12-14 Example of Changing the Period in Absolute Duty Cycle (@4MHz)
58
SEP. 2004 Ver 2.00