SMBP2501BPB datasheet(76/107 Pages) SONIX

76 / 107 page

SN8P2501B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 76

Version 2.1

8.2 TIMER 0 (T0)

8.2.1 OVERVIEW

The T0 is an 8-bit binary up timer and event counter. If T0 timer occurs an overflow (from FFH to 00H), it will continue

counting and issue a time-out signal to trigger T0 interrupt to request interrupt service.

The main purposes of the T0 timer is as following.



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

clock frequency.



RTC timer: Generates interrupts at real time intervals based on the selected clock source. RTC function is only

available in High_Clk code option = "IHRC_RTC" and

“32K X’tal” .



Green mode wakeup function: T0 can be green mode wake-up time as T0ENB = 1. System will be wake-up by

T0 time out.

Fcpu

T0 Rate

(Fcpu/2~Fcpu/256)

T0ENB

CPUM0,1

T0C 8-Bit Binary Up Counting Counter

T0 Time Out

Load

Internal Data Bus

T0ENB

RTC

T0TB



Note:1. In RTC mode, clear T0IRQ must be after 1/2 RTC clock source (32768Hz), or the RTC interval time

is error. The delay is about 16us and use T0 interrupt service routine executing time to be the

16us delay time.

2. In RTC mode, the T0 interval time is fixed at 0.5 sec and T0C is 256 counts.

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