HMS87C1304A Datasheet, PDF (44/70 Pages) Hynix Semiconductor – CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

HMS87C1304A/HMS87C1302A
HYUNDAI MicroElectronics
fxin
T1
PWM
POL=1
PWM
POL=0
00 01 02
03
04
05
7F
80
81
Duty Cycle [80H x 125nS = 16uS]
3FF 00 01 02
03
Period Cycle [3FFH x 125nS = 127.875uS, 7.8KHz]
T1CK[1:0] = 00 (fxin)
PWM0HR = 0CH
Period PWM0HR3 PWM0HR2
1
1
T1PPR (8-bit)
FFH
T1PPR = FFH
T1PDR = 80H
T1CK[1:0] = 10 (1uS)
PWM0HR = 00H
T1PPR = 0EH
T1PDR = 05H
Source
clock
Duty
PWM0HR1 PWM0HR0
0
0
T1PDR (8-bit)
80H
ry _{Figure 12-11 Example of PWM at 8MHz}
Prelimina ^{Write T1PPR to 0AH}
Period changed
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 1uS = 5uS]
Period Cycle [0EH x 1uS = 14uS, 71KHz]
Duty Cycle
[05H x 1uS = 5uS]
Duty Cycle
[05H x 1uS = 5uS]
Period Cycle [0AH x 1uS = 10uS, 100KHz]
Figure 12-12 Example of Changing the Period in Absolute Duty Cycle (@8MHz)
44
Preliminary
Jan. 2001