HT48C062 datasheet(9/31 Pages) HOLTEK

9 / 31 page

HT48R062/HT48C062

Rev. 1.11

October 30, 2006

Input/Output Ports

There are up to 11 bidirectional input/output lines in the

microcontroller labeled with port names PA and PB,

which are mapped to the data memory of [12H] and

[14H] respectively. All of these I/O ports can be used for

input and output operations. For input operation, these

ports are non-latching, that is, the inputs must be ready

at the T2 rising edge of instruction

²MOV A,[m]² (m=12H

or 14H). For output operation, all the data is latched and

remains unchanged until the output latch is rewritten.

Each I/O line has its own control register (PAC, PBC) to

control the input/output configuration. With this control

without pull-high resistor structures can be reconfigured

dynamically (i.e. on-the-fly) under software control. To

function as an input, the corresponding latch of the con-

trol register must write

²1². The input source also de-

pends on the control register. If the control register bit is

²1², the input will read the pad state. If the control regis-

ter bit is

²0², the contents of the latches will move to the

internal bus. The latter is possible in the

²read-modify-

write

² instruction.

For output function, CMOS is the only configuration.

These control registers are mapped to locations 13H

and 15H.

The chip reset status of the registers is summarized in the following table:

Reset

(Power-on)

WDT Time-out

(Normal Operation)

RES Reset

(Normal Operation)

RES Reset

(HALT)

WDT Time-out

(HALT)*

Program Counter

000H

-xxx xxxx

-uuu uuuu

ACC

xxxx xxxx

uuuu uuuu

TBLP

xxxx xxxx

uuuu uuuu

TBLH

--xx xxxx

--uu uuuu

WDTS

0000 0111

uuuu uuuu

STATUS

--00 xxxx

--1u uuuu

--uu uuuu

--01 uuuu

--11 uuuu

1111 1111

uuuu uuuu

PAC

1111 1111

uuuu uuuu

---- -111

---- -uuu

PBC

---- -111

---- -uuu

Note:

²*² means ²warm reset²

²u² means ²unchanged²

²x² means ²unknown²

V D D

P A 0 ~ P A 7

P B 0 ~ P B 2

W a k e - u p O p t i o n

S y s t e m W a k e - u p

( P A o n l y )

R e a d D a t a R e g i s t e r

C K

C o n t r o l B i t P u l l - h i g h

D a t a B u s

W r i t e C o n t r o l R e g i s t e r

C h i p R e s e t

R e a d C o n t r o l R e g i s t e r

W r i t e D a t a R e g i s t e r

D a t a B i t

C K

Input/Output Ports

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