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HTG12G0

Microcontroller

Holtek Semiconductor 

HTG12G0

• Location 0008H

This area is reserved for RTC interrupt serv-

ice program.

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

and 0F00H~0FFFH.

The last 256 bytes of each page in the program

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 areas may function as a normal pro-

gram memory depending on the require-

ments.

Certain locations in bank 1 of the program

memory are reserved for specific usage:

• Location 1000H

This area is reserved for the initialization pro-

gram. After reset, the CPU always begins exe-

cution at location 1000H.

• Location 1004H

This area is reserved for TIMER interrupt

service program. A timer interrupt results

from TIMER overflow, if interrupt is enabled,

the CPU begins execution at location 1004H.

• Location 1008H

This area is reserved for RTC interrupt serv-

ice program.

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

and 1F00H~1FFFH.

The last 256 bytes of each page in the program

memory, addressed from 1n00H to 1nFFH and

1F00H to 1FFFH 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 areas may function as a normal pro-

gram memory depending on the requirements.

The program memory (ROM) mapping is

shown below:

Program memory

In the execution of an instruction, the pro-

gram counter is added before the executing

phase. So a careful manipulation of READ

MR0A and READ R4A is needed in the page

margin.

Stack register

This is a special group of register which is used

to save the contents of the program counter

(PC) and is organized with 13 bits×1 level. One

bit is used to store the carry flag. An interrupt

will force the contents of the PC and the carry

flag onto the stack register. A subroutine call

will also cause the PC contents to be pushed

onto the stack; however the carry flag will not

be stored. At the end of a subroutine or inter-

rupt routine which is signaled by a return in-

struction, RET or RETI restores the program

counter to its previous value from stack register.

Executing “RETI” instruction will restore the

carry flag from the stack register, but “RET”

does not.

9

14th May ’99

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