HT48R01B-1 View Datasheet(PDF) - Holtek Semiconductor

Part Name

Description

MFG CO.

HT48R01B-1

Small Package 8-Bit OTP MCU

Holtek Semiconductor 

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HT46R01B-1/HT46R01N-1

HT48R01B-1/HT48R01N-1

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

power-on reset occurs.

Item

Program Counter

Interrupts

WDT

Timer/Event Counter

Prescaler

Input/Output Ports

Stack Pointer

Condition After RESET

Reset to zero

All interrupts will be disabled

Clear after reset, WDT begins counting

Timer Counter will be turned off

The Timer Counter Prescaler will be cleared

I/O ports will be setup as inputs

Stack Pointer will point to the top of the stack

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.

HT46R01B-1/HT46R01N-1

Register

PCL

MP0

MP1

ACC

TBLP

Power-on

Reset

0000 0000

xxxx xxxx

xxxx xxxx

xxxx xxxx

xxxx xxxx

TBLH

WDTS

STATUS

-xxx xxxx

---- -111

--00 xxxx

INTC0

-000 0000

INTC1

TMR0

TMR0C

TMR1

--00 --00

xxxx xxxx

0000 1000

xxxx xxxx

TMR1C

PA

PAC

PAWK

0000 1---

1111 1111

1111 1111

0000 0000

PAPU

-000 0000

PB

---- --11

PBC

---- --00

PBPU

CTRL0

CTRL1

PWM

---- --00

-00- 0000

1000 1010

xxxx xxxx

RES or LVR

Reset

0000 0000

uuuu uuuu

uuuu uuuu

uuuu uuuu

uuuu uuuu

-uuu uuuu

---- -111

--uu uuuu

-000 0000

--00 --00

xxxx xxxx

0000 1000

xxxx xxxx

0000 1---

1111 1111

1111 1111

0000 0000

-000 0000

---- --11

---- --00

---- --00

-00- 0000

1000 1010

xxxx xxxx

WDT Time-out

(Normal Operation)

0000 0000

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uuuu uuuu

uuuu uuuu

uuuu uuuu

-uuu uuuu

---- -111

--1u uuuu

-000 0000

--00 --00

xxxx xxxx

0000 1000

xxxx xxxx

0000 1---

1111 1111

1111 1111

0000 0000

-000 0000

---- --11

---- --00

---- --00

-00- 0000

1000 1010

xxxx xxxx

WDT Time-out

(HALT)

0000 0000

uuuu uuuu

uuuu uuuu

uuuu uuuu

uuuu uuuu

-uuu uuuu

---- -uuu

--11 uuuu

-uuu uuuu

--uu --uu

uuuu uuuu

uuuu uuuu

uuuu uuuu

uuuu u---

uuuu uuuu

uuuu uuuu

uuuu uuuu

-uuu uuuu

---- --uu

---- --uu

---- --uu

-uu- uuuu

uuuu uuuu

uuuu uuuu

Rev.1.00

27

June 9, 2011

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