HT85F2270 datasheet(86/226 Pages) HOLTEK

86 / 226 page

Rev. 1.00

86 of ��6

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

ROM Code Check Reset

ID block addresses 0xF0~0xFF can be written into ROM codes such as the following table shows,

or a value of FFH which means no ROM codes are written into these addresses. When reading the

option table, the hardware will automatically compare with the ROM code pattern, if any one of the

ID block addresses has a mismatch, the MCU will automatically reset and re-read the option table

until all the ID block addresses are matched.

ID block address

ROM code

0xF0

01H/FFH

0xF1

��H/FFH

0xF�

4�H/FFH

0xF�

67H/FFH

0xF4

89H/FFH

0xF�

ABH/FFH

0xF6

CDH/FFH

0xF7

EFH/FFH

0xF8

FEH/FFH

0xF9

DCH/FFH

0xFA

BAH/FFH

0xFB

98H/FFH

0xFC

76H/FFH

0xFD

�4H/FFH

0xFE

��H/FFH

0xFF

10H/FFH

Reset Initial Conditions

The different types of reset described affect the reset flags in different ways. The following table

indicates the way in which the various components of the microcontroller are affected after a

power-on reset occurs.

Item

Condition After RESET

Program Counter

Reset to zero

Interrupts

All interrupts will be disabled

WDT

Clear after reset� WDT begins counting

Timer/Even Counters

Timer/Even Counters will be turned off

Input/Output Ports

I/O ports will be setup as a quasi-bidirection structure

Stack Pointer

Set to 007H value

The different kinds of resets all affect the internal registers of the microcontroller in different ways.

To ensure reliable continuation of normal program execution after a reset occurs, it is important to

know what condition the microcontroller is in after a particular reset occurs. The following table

describes how each type of reset affects each of the microcontroller internal registers.

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