HT49R50 datasheet(12/59 Pages) HOLTEK

12 / 59 page

HT49R50

October 22, 1999

Of the two types of functional groups, the special

function registers consist of an Indirect address-

ing register 0 (00H), a Memory pointer register 0

(MP0;01H), an Indirect addressing register 1

(02H), a Memory pointer register 1 (MP1;03H), a

Bank pointer (BP;04H), an Accumulator

(ACC;05H), a Program counter lower-order byte

a Table higher-order byte register (TBLH;08H), a

Real time clock control register (RTCC;09H), a

Status register (STATUS;0AH), an Interrupt

control register 0 (INTC0;0BH), a timer/event

counter 0 (TMR0;0DH), a timer/event counter 0

control register (TMR0C;0EH), a timer/event

counter 1 (TMR1;10H), a timer/event counter 1

control register (TMR1C;11H), I/O registers

(PA;12H, PB;14H, PC;16H), and Interrupt con-

trol register 1 (INTC1;1EH). On the other hand,

the general purpose data memory, addressed

from 60H to FFH, is used for data and control in-

formation under instruction commands.

The areas in the RAM can directly handle

arithmetic, logic, increment, decrement, and

rotate operations. Except some dedicated bits,

each bit in the RAM can be set and reset by

"SET [m].i" and "CLR [m].i" They are also indi-

rectly accessible through the Memory pointer

Indirect addressing register

Location 00H and 02H are indirect addressing

registers that are not physically implemented.

Any read/write operation of [00H] and [02H] ac-

cesses the RAM pointed to by MP0 (01H) and

MP1(03H) respectively. Reading location 00H

or 02H indirectly returns the result 00H.

While, writing it indirectly leads to no opera-

tion.

The function of data movement between two indi-

rect addressing registers is not supported. The

memory pointer registers, MP0 and MP1, are

both 8-bit registers used to access the RAM by

combining corresponding indirect addressing reg-

isters. MP0 can only be applied to data memory,

while MP1 can be applied to data memory and

LCD display memory.

Accumulator - ACC

The accumulator (ACC) is related to the ALU

operations. It is also mapped to location 05H of

the RAM and is capable of operating with im-

mediate data. The data movement between two

data memory locations must pass through the

ACC.

G ene r a l P u r p os e

DAT A M E M O R Y

( 160 B y t e s )

S pec i a l P u r pos e

DAT A M E M O R Y

00H

01H

02H

03H

04H

05H

06H

07H

08H

09H

0AH

0B H

0C H

0D H

0E H

0F H

10H

11H

12H

13H

14H

15H

16H

17H

18H

19H

1AH

1B H

1C H

1D H

1E H

1F H

FF H

: U n u s e d .

R ead a s " 0"

60H

IN T C 1

MP 0

I n d i r e ct Ad d r e ss i n g R e g i st e r 0

I n d i r e ct Ad d r e ss i n g R e g i st e r 1

MP 1

ACC

PC L

TB L P

TB L H

RT CC

ST AT U S

IN T C 0

TM R 0

TM R 0 C

TM R 1

TM R 1 C

RAM mapping

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