HT46R53 datasheet(7/42 Pages) HOLTEK

7 / 42 page

HT46R53/HT46R54

Rev. 1.40

July 12, 2005

The lower byte of the PC (PCL) is a readable and

writeable register (06H). Moving data into the PCL per-

forms a short jump. The destination is within 256 loca-

tions.

When a control transfer takes place, an additional

dummy cycle is required.

Program Memory

- EPROM

The program memory is used to store the program in-

structions which are to be executed. It also contains

data, table, and interrupt entries, and is organized into

2048

´14 (HT46R53), or 4096´15 (HT46R54) bits, ad-

dressed by the Program Counter and table pointer.

Certain locations in the ROM are reserved for special

usage:

· Location 000H

This location is reserved for program initialization. Af-

ter a chip reset, the program always begins execution

at location 000H.

· Location 004H

This location is reserved for the external interrupt ser-

vice program. If the INT input pin is activated, the in-

terrupt is enabled and the stack is not full, the program

begins execution at this location.

· Location 008H

This location is reserved for the timer/event counter

interrupt service program. If a timer interrupt results

from a timer/event counter overflow, and the interrupt

is enabled and the stack is not full, the program begins

execution at location 008H.

· Location 00CH

Location 00CH is reserved for the A/D converter inter-

rupt service program. If an A/D converter interrupt re-

sults from an end of A/D conversion, and if the

interrupt is enabled and the stack is not full, the pro-

gram begins execution at location 00CH.

· Table location

Any location in the program memory can be used as

look-up tables. The instructions

²TABRDC [m]² (the

1 4 b i t s

P r o g r a m

M e m o r y

D e v i c e I n i t i a l i z a t i o n P r o g r a m

E x t e r n a l I n t e r r u p t S u b r o u t i n e

T i m e r / E v e n t C o u n t e r I n t e r r u p t S u b r o u t i n e

L o o k - u p T a b l e ( 2 5 6 w o r d s )

N o t e : n = 0 ~ 7

A / D C o n v e r t e r I n t e r r u p t S u b r o u t i n e

n 0 0 H

7 0 0 H

n F F H

0 0 0 H

0 0 4 H

0 0 8 H

0 0 C H

0 1 0 H

0 1 4 H

0 1 8 H

7 F F H

H T 4 6 R 5 3

1 5 b i t s

P r o g r a m

M e m o r y

D e v i c e I n i t i a l i z a t i o n P r o g r a m

E x t e r n a l I n t e r r u p t S u b r o u t i n e

T i m e r / E v e n t C o u n t e r I n t e r r u p t S u b r o u t i n e

L o o k - u p T a b l e ( 2 5 6 w o r d s )

N o t e : n = 0 ~ F

A / D C o n v e r t e r I n t e r r u p t S u b r o u t i n e

n 0 0 H

F 0 0 H

n F F H

0 0 0 H

0 0 4 H

0 0 8 H

0 0 C H

0 1 0 H

0 1 4 H

0 1 8 H

F F F H

H T 4 6 R 5 4

Program Memory

Instruction

Table Location

b11

b10

TABRDC [m]

P11

P10

TABRDL [m]

1111

Table Location

Note:

b11~b0: Table location bits

P11~P8: Current program counter bits

@7~@0: Table pointer bits

For the HT46R53, since the program counter is 11 bits wide (b0~b10), the b11 columns in the table are not ap-

plicable

For the HT46R54, the TABRDC program counter is 12 bits wide. From b0~b11

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