HT85F2270 datasheet(84/226 Pages) HOLTEK

84 / 226 page

Rev. 1.00

84 of ��6

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

Software Resets

There are three ways to generate Software Reset, each of which are generated by writing certain

values to the SRST register, the WDTCR register or the LVRCR register.

Software Reset Summary

Software Reset Name

Bit

Operation

SRST Register

SRST

SRSTREQ Write two successive “1” values to this bit

WDTRCR Register

WDTCR

WE4~WE0 Write value other than “10101” or “01010”

LVRCR Register

LVRCR

LVS7~LVS0 Write value other than “01010101”� “00110011”� “011001”

or “10101010”

SRST Register Software Reset

A software reset will be generated after two consecutive instructions to write a high value to the

SRSTREQ bit in the SRST register. The same bit can be used to identify the reset source.

SRST Register

SFR Address: F7h

Bit

Label

—

SRSTREQ

R/W

—

R/W

POR

—

Bit 7~1

Unimplemented, read as “0”

Bit 0

SRSTREQ: Software reset request.

Writing a ‘0’ value to this bit will have no effect.

A single ‘1’ value write to this bit will have no effect.

Two consecutive ‘1’ value writes to this bit will generate a software reset.

Reading this bit can indicate the reset source:

0: No software reset

1: Software reset

This bit must be cleared by the application program as it will not be automatically

cleared by hardware.

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