ST2202A datasheet(63/75 Pages) SITRONIX

Part #	ST2202A

Description	8 BIT Integrated Microcontroller with 256K Bytes ROM

PDF	75 Pages

Scroll/Zoom	100%

Manufacturer	SITRONIX [Sitronix Technology Co., Ltd.]

Direct Link	http://www.sitronix.com.tw

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63 / 75 page

ST2202A

Ver 2.5

63/75

9/16/2008

2.. L

W V

E D

ST2202 has a built-in low voltage detector for power

management. The typical active level of voltage detection is

2.6V. When LVDEN (SYS[0]) is set, detector circuit is

enabled and the detection result will be outputted at the

same bit after 3 µs. Using read instruction twice can get this

result: first read will enable initial stableness control.

Second read equal '0' represents 'low voltage'. Once low

voltage detector is enabled, it keeps on consuming power.

So it is important that remember to write “0” to LVDET to

disable the detector after detection is completed. One

sample program is shown below:

Start:

SMB0

<SYS

; enable detector

Wait 3 µ

µs

SEC

BBS0

<SYS,$+3

BBS0

<SYS,Normal_Voltage

Low_Voltage:

CLC

Normal_Voltage:

RMB0

<SYS

; disable detector

ST2202A Datasheet(PDF) 63 Page - Sitronix Technology Co., Ltd.