HT45F23 datasheet(28/152 Pages) HOLTEK

28 / 152 page

Special Function Registers

Most of the Special Function Register details will be described in the relevant functional section,

however several registers require a separate description in this section.

Indirect Addressing Registers

- IAR0, IAR1

The Indirect Addressing Registers, IAR0 and IAR1, although having their locations in normal RAM

for RAM data manipulation uses these Indirect Addressing Registers and Memory Pointers, in

contrast to direct memory addressing, where the actual memory address is specified. Actions on the

IAR0 and IAR1 registers will result in no actual read or write operation to these registers but rather to

the memory location specified by their corresponding Memory Pointer, MP0 or MP1. Acting as a pair,

IAR0 with MP0 and IAR1 with MP1, can together access data from the Data Memory. As the Indirect

Addressing Registers are not physically implemented, reading the Indirect Addressing Registers

indirectly will return a result of

²00H² and writing to the registers indirectly will result in no operation.

Rev. 1.20

September 15, 2011

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

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

2 0 H

I A R 0

M P 0

I A R 1

M P 1

B P

A C C

P C L

T B L P

T B L H

T B C

S T A T U S

I N T C 0

U n u s e d

T M R 0

T M R 0 C

T M R 1 H

T M R 1 L

T M R 1 C

P A

P A C

P B

P B C

P C

P C C

L V D C

D A C T R L

P W M 0

P W M 1

B P C T L

W D T C

I N T C 1

O P A 1 C 0

O P A 1 C 1

2 1 H

2 2 H

2 3 H

2 4 H

2 5 H

2 6 H

2 7 H

2 8 H

2 9 H

2 A H

2 B H

2 C H

2 D H

2 E H

2 F H

3 0 H

3 1 H

3 2 H

3 3 H

3 4 H

3 5 H

3 6 H

3 7 H

3 8 H

3 9 H

3 A H

3 B H

3 C H

3 D H

3 E H

3 F H

4 0 H

B a n k 0 , 1

B a n k 0

B a n k 1

O P A 2 C 0

O P A 2 C 1

O P A 2 C 2

A D R L

A D R H

A D C R

A C S R

S M O D

P A W U

P A P U

P B P U

P C P U

A D P C R

I N T E D G E

C M P 1 C 0

C M P 1 C 1

C M P 2 C 0

C M P 2 C 1

M I S C

M F I C 0

M F I C 1

S I M C 0

S I M C 1

S I M D

S I M A / S I M C 2

E E A

E E D

L C D C

L D O C

D A L

D A H

U n u s e d

E E C

Special Purpose Data Memory

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