HT48C05 Ver la hoja de datos (PDF) - Holtek Semiconductor

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HT48C05

Cost-Effective I/O Type 8-Bit MCU

Holtek Semiconductor 

HT48R05A-1/HT48C05/HT48R06A-1/HT48C06

VDD

RES

S S T T im e - o u t

C h ip R e s e t

tS S T

Reset Timing Chart

V DD

0 .0 1 m F *

100kW

RES

10kW

0 .1 m F *

Reset Circuit

Note:

²*² Make the length of the wiring, which is con-

nected to the RES pin as short as possible, to

avoid noise interference.

An extra option load time delay is added during system

reset (power-up, WDT time-out at normal mode or RES

reset).

H A LT

W DT

W a rm R e s e t

RES

O SC1

SST

1 0 - b it R ip p le

C o u n te r

C o ld

R eset

S y s te m R e s e t

Reset Configuration

The functional unit chip reset status are shown below.

PC

000H

Interrupt

Disable

Prescaler

Clear

WDT

Clear. After master reset,

WDT begins counting

Timer/Event Counter Off

Input/Output Ports Input mode

SP

Points to the top of the stack

The states of the registers is summarized in the table.

Register

Reset

WDT time-out

RES Reset

(Power On) (Normal Operation) (Normal Operation)

TMR

xxxx xxxx

xxxx xxxx

xxxx xxxx

TMRC

00-0 1000

00-0 1000

00-0 1000

Program

Counter

000H

000H

000H

MP

-xxx xxxx

-uuu uuuu

-uuu uuuu

ACC

xxxx xxxx

uuuu uuuu

uuuu uuuu

TBLP

xxxx xxxx

uuuu uuuu

uuuu uuuu

TBLH

--xx xxxx

--uu uuuu

--uu uuuu

STATUS

--00 xxxx

--1u uuuu

--uu uuuu

INTC

--00 -000

--00 -000

--00 -000

WDTS

0000 0111

0000 0111

0000 0111

PA

1111 1111

1111 1111

1111 1111

PAC

1111 1111

1111 1111

1111 1111

PB

---- -111

---- -111

---- -111

PBC

---- -111

---- -111

---- -111

PC

---- --11

---- --11

---- --11

PCC

---- --11

---- --11

---- --11

RES Reset

(HALT)

xxxx xxxx

00-0 1000

000H

-uuu uuuu

uuuu uuuu

uuuu uuuu

--uu uuuu

--01 uuuu

--00 -000

0000 0111

1111 1111

1111 1111

---- -111

---- -111

---- --11

---- --11

Note:

²*² means ²warm reset²

²u² means ²unchanged²

²x² means ²unknown²

WDT Time-out

(HALT)*

uuuu uuuu

uu-u uuuu

000H

-uuu uuuu

uuuu uuuu

uuuu uuuu

--uu uuuu

--11 uuuu

--uu -uuu

uuuu uuuu

uuuu uuuu

uuuu uuuu

---- -uuu

---- -uuu

---- --uu

---- --uu

Rev. 1.10

12

June 9, 2004

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