HTG13J0 查看數據表（PDF） - Holtek Semiconductor

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HTG13J0

4-Bit Microcontroller

Holtek Semiconductor 

Program memory - ROM

The program memory is used to store program

instruction which is to be executed. It is orga-

nized with 8192 ´ 8 bits and addressed by the

program counter and PA3.

Certain locations in bank 0 of the program

memory are reserved for specific usage:

· Location 0004H

This area are reserved for TIMER interrupt

service program. A timer interrupt resulting

from TIMER overflow, if interrupt is enabled

the CPU begins execution at location 0004H.

· Location 0008H

Activating the PS or PP input pins of the pro-

cessor with the interrupts enabled during

HALT mode causes the program to jump to

this location.

· Location 0n00H~0nFFH (n=current number)

and 0F00H~0FFFH.

The last 256 bytes of each page in the pro-

gram memory, addressed from 0n00H to

0nFFH and 0F00H to 0FFFH can be used as a

look up table. The instructions READ R4A,

READ MR0A, READF R4A, READF MR0A

can read the table and transfer the contents of

the table to ACC and R4 or transfer to ACC

and data memory addressed by register pair

R1,R0 . These area may function as normal

program memory depending on the require-

ment. Note that the page number n must be

greater than zero, some locations in page 0

are reserved for specific usage as mentioned.

Certain locations in bank 1 of the program

memory are reserved for specific usage:

· Location 1000H

This area are reserved for the initialization

program. After reset, the CPU always begins

execution at location 1000H.

· Location 1004H

This area is reserved for TIMER interrupt

service program. A timer interrupt resulting

from TIMER overflow, if interrupt is enabled,

the CPU begins execution at location 1004H.

HT13J0

· Location 1008H

Activating the PS or PP input pins of the pro-

cessor with the interrupts enabled during

HALT mode causes the program to jump to

this location.

· Location 1n00H~1nFFH (n=current number)

and 1F00H~1FFFH.

The last 256 bytes of each page in the pro-

gram memory, addressed from 1n00H to

1nFFH and 1F00H to 1FFFH can be used as a

loop up table. The instructions READ R4A,

READ MR0A, READF R4A, READF MR0A

can read the table and transfer the contents of

the table to ACC and R4 or transfer to ACC

and data memory addressed by register pair

"R1,R0" These area may function as normal

program memory depending on the require-

ment. Note that the page number n must be

greater than zero, some locations in page 1

are reserved for specific usage as mentioned.

The program memory (ROM) mapping is shown

below:

0000H

0003H

0004H

0007H

0008H

000BH

Timer interrupt subroutine of bank 0

External interrupt subroutine of bank 0

Page n look-up table (256 bytes) of bank 0

0F00H

0FFFH

1000H

1003H

1004H

1007H

1008H

100BH

Page F look-up table (256 bytes) of bank 0

Reset initial program

Timer interrupt subroutine of bank 1

External interrupt subroutine of bank 1

Page look-up table (256 bytes) of bank 1

1F00H

1FFFH

Page F look-up table (256 bytes) of bank 1

8 bits

Program memory

Program ROM

9

May 19, 1999

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