SN8P1602AX datasheet(63/94 Pages) SONIX

63 / 94 page

SN8P1600

8-bit micro-controller

SONiX TECHNOLOGY CO., LTD

Page 63

Revision 1.94

PWM FUNCTION DESCRIPTION (SN8P1604 Only)

OVERVIEW

PWM function is generated by TC1 timer counter and output the PWM signal to PWM1OUT pin (P5.3). The 8-bit

counter counts modulus 256, from 0-255, inclusive. The value of the 8-bit counter is compared to the contents of the

reference register TC1R. When the reference register value TC1R is equal to the counter value TC1C, the PWM

output goes low. When the counter reaches zero, the PWM output is forced high. The low-to-high ratio (duty) of the

PWM1 output is TC1R/256.

All PWM outputs remain inactive during the first 256 input clock signals. Then, when the counter value (TC1C)

changes from FFH back to 00H, the PWM output is forced to high level. The pulse width ratio (duty cycle) is defined by

the contents of the reference register (TC1R) and is programmed in increments of 1:256. The 8-bit PWM data register

TC1R is a write only register.

PWM output can be held at low level by continuously loading the reference register with 00H. Under PWM operating, to

change the PWM’s duty cycle is to modify the TC1R.

Reference Register Value (TC1R)

Duty

0000 0000

0/256

0000 0001

1/256

0000 0010

2/256

1000 0000

128/256

1000 0001

129/256

1111 1110

254/256

1111 1111

255/256

TC1 Clock

TC1R = 00H

TC1R = 80H

TC1R = 01H

TC1R = FFH

High

Low

High

Low

High

128

..... 254 255

.....

128

..... 254 255

.....

TC1 Clock

TC1R = 00H

TC1R = 80H

TC1R = 01H

TC1R = FFH

High

Low

High

Low

High

Low

High

128

..... 254 255

.....

128

..... 254 255

.....

128

..... 254 255

.....

128

..... 254 255

.....

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