HT47C20 datasheet(10/56 Pages) HOLTEK

10 / 56 page

HT47C20

January 18, 2000

the stack is not full, the program begins exe-

cution at location 004H.

· Location 008H

This area is reserved for the time base interrupt

service program. If time base interrupt results

from a time base overflow, and if the interrupt is

enabled and the stack is not full, the program

begins execution at location 008H.

· Location 00CH

This area is reserved for the real time clock in-

terrupt service program. If a real time clock

interrupt results from a real time clock over-

flow, and if the interrupt is enabled and the

stack is not full, the program begins execution

at location 00CH.

· Location 010H

This area is reserved for the timer/event coun-

ter interrupt service program. If a timer inter-

rupt results from a timer/event counter A or B

overflow, and if the interrupt is enabled and

the stack is not full, the program begins exe-

cution at location 010H.

· Table location

Any location in the ROM 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 higher-order byte of the table word are

transferred to the TBLH. The table

higher-order byte register (TBLH) is read

only. The table pointer (TBLP) is a read/write

tion. Before accessing the table, the location

Mode

Program Counter

*10 *9

Initial reset

0000000000

External interrupt

0000000010

Time base interrupt

0000000100

RTC interrupt

0000000110

Timer/event counter interrupt

0000001000

Skip

PC+2

Loading PCL

*10 *9

Jump, call branch

#10 #9

Return from subroutine

S10 S9

Program counter

Note: *10~*0: Program counter bits

#10~#0: Instruction code bits

S10~S0: Stack register bits

@7~@0: PCL bits

000 H

004 H

008 H

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

Ex t er nal i nt er r u pt s ub r out i n e

P r ogr a m

RO M

16 b i t s

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

7F F H

N o t e : n r anges f r o m 0 t o 7

00C H

T i m e b a s e i n te r r u p t s u b r o u t i n e

R T C i n t e r r u p t s ubr out i n e

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

n00H

nF F H

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

010H

Program memory

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