HT827A0 データシートの表示（PDF） - Holtek Semiconductor

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HT827A0

8-Bit Microcontroller with Voice ROM

Holtek Semiconductor 

HT827A0

Program memory - ROM

The program memory stores the to-be-executed

program instructions. It also includes data, ta-

ble and interrupt entries, addressed by the pro-

gram counter along with the table pointer.

The program memory size for HT827A0 is

8K´16.

Certain locations in the program memory are

reserved for special usage:

· Location 000H

This area is reserved for program initializa-

tion. The program always begins execution at

location 000H each time the system is reset.

· Location 004H

This area is reserved for an external interrupt

service program. The program begins execu-

tion at location 004H if the INT input pin is

activated, the interrupt is enabled and the

stack is not full.

· Location 008H

This area is reserved for a voice sampling rate

counter interrupt service program. The pro-

gram begins execution at location 008H if a

timer interrupt results from a sampling rate

000H

D e v ic e in itia liz a tio n p r o g r a m

004H

E x te r n a l in te r r u p t s u b r o u tin e

008H

S a m p lin g r a te c o u n te r in te r r u p t s u b r o u tin e

00C H

T im e r /e v e n t c o u n te r in te r r u p t s u b r o u tin e

L o o k - u p ta b le ( 2 5 6 w o r d s )

P ro g ra m

ROM

1FFFH

L o o k - u p ta b le ( 2 5 6 w o r d s )

Program memory

counter overflow, the interrupt is enabled and

the stack is not full.

· Location 00CH

This area is reserved for a timer/event coun-

ter interrupt service program. The program

begins execution at location 00CH if an inter-

rupt results from a timer/event counter over-

flow, the interrupt is enabled and the stack is

not full.

Mode

Initial reset

External interrupt

Sampling rate counter

overflow

Timer/event counter

overflow

Skip

Loading PCL

Jump, call branch

Return from subroutine

Program Counter

*12 *11 *10 *9 *8 *7 *6 *5 *4 *3 *2 *1 *0

00000000000 0 0

00000000001 0 0

00000000010 0 0

00000000011 0 0

PC+2

*12 *11 *10 *9 *8 @7 @6 @5 @4 @3 @2 @1 @0

#12 #11 #10 #9 #8 #7 #6 #5 #4 #3 #2 #1 #0

S12 S11 S10 S9 S8 S7 S6 S5 S4 S3 S2 S1 S0

Note:

Program counter

*12~*0: Bits of program counter

#12~#0: Bits of instruction code

S12~S0: Bits of stack register

@7~@0: Bits of PCL

9

March 15, 2000

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