Hyundai Micro Electronics
GMS81C2020/GMS81C2120
fXI
T1
00 01
00 01
02
03
04
05
7F
80
81
3FF
02
03
PWM
POL=1
PWM
POL=0
Duty Cycle [ 80H x 250nS = 32uS ]
Period Cycle [ 3FFH x 250nS = 255.75uS, 3.9KHz ]
T1CK[1:0] = 00 ( fXI )
PWM1HR = 0CH
T1PPR (8-bit)
PWM1HR3PWM1HR2
Period
Duty
1
1
FFH
T1PPR = FFH
T1PDR = 80H
T1PDR (8-bit)
80H
PWM1HR1PWM1HR0
0
0
Figure 15-11 Example of PWM at 4MHz
T1CK[1:0] = 10 ( 1uS )
PW M 1HR = 00H
T1PPR = 0EH
Write T1PPR to 0AH
Period changed
T1PDR = 05H
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
PWM
POL=1
Duty Cycle
[ 05H x 2uS = 10uS ]
Duty Cycle
[ 05H x 2uS = 10uS ]
Duty Cycle
[ 05H x 2uS = 10uS ]
Period Cycle [ 0EH x 2uS = 28uS, 35.5KHz ]
Period Cycle [ 0AH x 2uS = 20uS, 50KHz ]
Figure 15-12 Example of Changing the Period in Absolute Duty Cycle (@4MHz)
Nov. 1999 Ver 0.0
preliminary
59
HYNIX [ HYNIX SEMICONDUCTOR ]
