SC73P1601MATR datasheet(9/22 Pages) SILAN

9 / 22 page

SC73P1601

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.4

2009.08.03

Http: www.silan.com.cn

Page 9 of 22

Example: when the crystal oscillator select 455KHz, the corresponding time of port P50 is 2

12÷455≈9ms. This

means the time from TM=1111B to 1101 is 9ms, and the time from TM=1111B to 1110 is 4.5ms.See the following

program:

A#1000B

TM,A

TMRST

……

L,#TEMP

@LL,#1110B

LOOP:

A,TM

XOR

A,@LL

JMPS

LOOP

END

In above program, the time from TMRST start to END is 4.5ms, that it from TM=1111B to 1110B is 4.5ms..

Time change :

4.5ms

9ms

18ms

9ms

36ms

18ms

36ms

9ms

The maximum adjustable time of the timer is 2

16/fmain. When the timer acts as a WDT and the timer is activated,

it must execute the TMRST instruction and clear the timer in 2

16/fmain’s time, otherwise, it will lead the WDT to

overflow, and causes the MCU to reset.

18. POC Circuit

The POC circuit monitors the power supply voltage and applies an internal reset to the micro-controller.

The POC circuit has the following functions:

•Generates an internal reset signal when VDD< VPOC. (Note 1)

•Cancels an internal reset signal when VDD > VPOC.

Here, VDD: power supply voltage. VPOC: POC detection voltage.

VDD

3.6V

2.0V

Internal reset signal

Reset

Note 1

Note 2

Operation mode

Operating ambient temperature Tamb=-20°C~+75°C

POC detection voltage VPOC =1.4V~1.6V

VPOC

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