GMS87C2020 datasheet(59/92 Pages) HYNIX

Part #	GMS87C2020

Description	CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver

PDF	92 Pages

Scroll/Zoom	100%

Manufacturer	HYNIX [Hynix Semiconductor]

Direct Link	http://www.skhynix.com/kor/main.do

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59 / 92 page

Hyundai Micro Electronics

GMS81C2020/GMS81C2120

Nov. 1999 Ver 0.0

preliminary

Figure 15-11 Example of PWM at 4MHz

Figure 15-12 Example of Changing the Period in Absolute Duty Cycle (@4MHz)

fXI

PWM

3FF

POL=1

PWM

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 ( fXI )

PWM1HR3PWM1HR2

PWM1HR1PWM1HR0

T1PPR (8-bit)

T1PDR (8-bit)

Period

Duty

FFH

80H

Source

PWM

POL=1

Duty Cycle

Period Cycle [ 0EH x 2uS = 28uS, 35.5KHz ]

PW M 1 HR = 0 0H

T 1PPR = 0 E H

T 1PDR = 0 5 H

T 1C K [1 :0 ] = 10 ( 1uS )

01 02

0B 0C 0D 0E

01 02 03

06 07

01 02

03 04

[ 05H x 2uS = 10uS ]

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

clock

GMS87C2020 Datasheet(PDF) 59 Page - Hynix Semiconductor

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