HT82K68 datasheet(8/40 Pages) HOLTEK

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Mode

Program Counter

*11 *10 *9

Initial reset

00000

Timer counter overflow

00001

Skip

PC+2

Loading PCL

*11 *10 *9

*8 @7 @6 @5 @4 @3 @2 @1 @0

Jump, call branch

#11 #10 #9

Return from subroutine

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

HT82K68E

August 8, 2000

Preliminary

Note: *11~*0: Program counter bits

#11~#0: Instruction code bits

S11~S0: Stack register bits

@7~@0: PCL bits

· Location 008H

This area is reserved for the timer counter in-

terrupt service program. If timer interrupt re-

sults from a timer counter overflow, and if the

interrupt is enabled and the stack is not full,

the program begins execution at location

008H.

· Table location

Any location in the PROM space can be used

as look-up tables. The instructions TABRDC

[m] (the current page, 1 page=256 words) and

TABRDL [m] (the last page) transfer the con-

tents of the lower-order byte to the specified

data memory, and the higher-order byte to

TBLH (08H). Only the destination of the

lower-order byte in the table is well-defined,

the other bits of the table word are trans-

ferred to the lower portion of TBLH, the re-

maining 1 bit is read as 0. The Table

Higher-order byte register (TBLH) is read

only. The TBLH is read only and cannot be re-

stored. If the main routine and the ISR (Inter-

rupt Service Routine) both employ the table

read instruction, the contents of the TBLH in

the main routine are likely to be changed by

the table read instruction used in the ISR. Er-

rors can occur. In other words, using the table

read instruction in the main routine and the

ISR simultaneously should be avoided. How-

ever, if the table read instruction has to be ap-

plied in both the main routine and the ISR,

the interrupt is supposed to be disabled prior

to the table read instruction. It will not be en-

abled until the TBLH has been backed up.

The table pointer (TBLP) is a read/write regis-

ter (07H), which indicates the table location.

Before accessing the table, the location must be

placed in TBLP. All table related instructions

need 2 cycles to complete the operation. These

areas may function as normal program memory

depending upon the requirements.

000H

008H

D e v i c e i ni t i al i z at i on pr ogr am

T i m e r / ev ent c o unt er i nt er r upt s ubr out i n e

P r ogr a m

PR O M

16 b i t s

Look - up t abl e ( 256 w o r d s )

n00H

Look - up t abl e ( 256 w o r d s )

B FFH

N o t e : n r a nges f r o m 0 t o B

nF F H

Program memory

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