SN8F2255B datasheet(82/133 Pages) SONIX

82 / 133 page

SN8F2250B Series

USB 2.0 Full-Speed 8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 82

Version 1.1

8.4 TIMER/COUNTER 0 (TC0)

8.4.1 OVERVIEW

The TC0 is an 8-bit binary up counting timer with double buffers. TC0 has two clock sources including internal clock

and external clock for counting a precision time. The internal clock source is from Fcpu. The external clock is INT0 from

P0.0 pin (Falling edge trigger). Using TC0M register selects TC0C’s clock source from internal or external. If TC0 timer

occurs an overflow, it will continue counting and issue a time-out signal to trigger TC0 interrupt to request interrupt

service. TC0 overflow time is 0xFF to 0X00 normally. Under PWM mode, TC0 overflow is decided by PWM cycle

controlled by ALOAD0 and TC0OUT bits.

The main purposes of the TC0 timer is as following.

8-bit programmable up counting timer: Generates interrupts at specific time intervals based on the selected

clock frequency.

External event counter: Counts system “events” based on falling edge detection of external clock signals at the

INT0 input pin.

Buzzer output

PWM output

Fcpu

TC0 Rate

(Fcpu/2~Fcpu/256)

INT0

(Schmitter Trigger)

TC0CKS

TC0ENB

CPUM0,1

TC0C

8-Bit Binary Up

Counting Counter

TC0R Reload

Data Buffer

Up Counting

Reload Value

TC0 Time Out

Compare

ALOAD0

TC0 Time Out

Auto. Reload

TC0 / 2

Buzzer

Internal P5.4 I/O Circuit

P5.4

PWM

PWM0OUT

TC0OUT

ALOAD0, TC0OUT

Load

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