HT46R53A datasheet(9/43 Pages) HOLTEK

9 / 43 page

HT46R53A/HT46R54A

Rev. 1.00

August 24, 2006

The ALU not only saves the results of a data operation

but also changes the status register.

Status Register

- STATUS

This 8-bit register (0AH) contains the zero flag (Z), carry

flag (C), auxiliary carry flag (AC), overflow flag (OV),

power down flag (PDF), and watchdog time-out flag

(TO). It also records the status information and controls

the operation sequence.

With the exception of the TO and PDF flags, bits in the

status register can be altered by instructions like most

other registers. Any data written into the status register

will not change the TO and PDF flags. Addition opera-

tions related to the status register may give different re-

sults from those intended. The TO flag can be affected

only by system power-up, a WDT time-out or executing

the

²HALT² or ²CLR WDT² instruction. The PDF flag can

be affected only by executing the

²HALT² or ²CLR

WDT

² instruction or a system power-up.

The Z, OV, AC, and C flags reflect the status of the latest

operations. On entering the interrupt sequence or exe-

cuting the subroutine call, the status register will not be

automatically pushed onto the stack. If the contents of

the status is important, and if the subroutine is likely to

corrupt the status register, the programmer should take

precautions and save it properly.

S p e c i a l P u r p o s e

D a t a M e m o r y

0 0 H

0 1 H

0 2 H

0 3 H

0 4 H

0 5 H

0 6 H

0 7 H

0 8 H

0 9 H

0 A H

0 B H

0 C H

0 D H

0 E H

0 F H

1 0 H

1 1 H

1 2 H

1 3 H

1 4 H

1 5 H

1 6 H

1 7 H

1 8 H

1 9 H

1 A H

1 B H

1 C H

1 D H

1 E H

1 F H

: U n u s e d

R e a d a s " 0 0 "

2 0 H

2 1 H

2 2 H

2 3 H

2 4 H

2 7 H

2 8 H

E 7 H

I n d i r e c t A d d r e s s i n g R e g i s t e r 0

M P 0

I n d i r e c t A d d r e s s i n g R e g i s t e r 1

M P 1

A C C

P C L

T B L P

T B L H

S T A T U S

I N T C

T M R

T M R C

P A

P A C

P B

P B C

P C

P C C

P D

P D C

P W M

A D R L

A D R H

A D C R

A C S R

G e n e r a l P u r p o s e

D a t a M e m o r y

( 1 9 2 B y t e s )

0 0 H

0 1 H

0 2 H

0 3 H

0 4 H

0 5 H

0 6 H

0 7 H

0 8 H

0 9 H

0 A H

0 B H

0 C H

0 D H

0 E H

0 F H

1 0 H

1 1 H

1 2 H

1 3 H

1 4 H

1 5 H

1 6 H

1 7 H

1 8 H

1 9 H

1 A H

1 B H

1 C H

1 D H

1 E H

1 F H

: U n u s e d

R e a d a s " 0 0 "

2 0 H

2 1 H

2 2 H

2 3 H

2 4 H

2 7 H

2 8 H

F F H

I n d i r e c t A d d r e s s i n g R e g i s t e r 0

M P 0

I n d i r e c t A d d r e s s i n g R e g i s t e r 1

M P 1

B P

A C C

P C L

T B L P

T B L H

S T A T U S

I N T C

T M R

T M R C

P A

P A C

P B

P B C

P C

P C C

P D

P D C

P W M

A D R L

A D R H

A D C R

A C S R

G e n e r a l P u r p o s e

D a t a M e m o r y

( 2 1 6 B y t e s )

S p e c i a l P u r p o s e

D a t a M e m o r y

G e n e r a l P u r p o s e

D a t a M e m o r y

( 6 4 B y t e s )

B a n k 1

4 0 H

7 F H

H T 4 6 R 5 3 A

H T 4 6 R 5 4 A

RAM Mapping

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