HT49R50 datasheet(10/59 Pages) HOLTEK

10 / 59 page

HT49R50

October 22, 1999

· Location 004H

Location 004H is reserved for the external in-

terrupt service program. If the INT0 input

pin is activated, and the interrupt is enabled,

and the stack is not full, the program begins

execution at location 004H.

· Location 008H

Location 008H is reserved for the external in-

terrupt service program also. If the INT1 in-

put pin is activated, and the interrupt is

enabled, and the stack is not full, the program

begins execution at location 008H.

· Location 00CH

Location 00CH is reserved for the timer/event

counter 0 interrupt service program. If a

timer interrupt results from a timer/event

counter 0 overflow, and if the interrupt is en-

abled and the stack is not full, the program

begins execution at location 00CH.

· Location 010H

Location 010H is reserved for the timer/event

counter 1 interrupt service program. If a

timer interrupt results from a timer/event

counter 1 overflow, and if the interrupt is en-

abled and the stack is not full, the program

begins execution at location 010H.

Mode

Program Counter

*11 *10 *9

Initial Reset

000000

External Interrupt 0

000000

External Interrupt 1

000000

Timer/event counter 0 overflow

000000

Timer/event counter 1 overflow

000000

Time Base Interrupt

000000

RTC Interrupt

000000

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

S1 S0

Program counter

Note:

*11~*0: Program counter bits

S11~S0: Stack register bits

#11~#0: Instruction code 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

E x t e r nal i nt er r u pt 0 s ubr o u t i ne

T i m e r / e v ent c ount e r 0 i nt er r upt s ubr out i n e

P r ogr am

RO M

15 b i t s

014H

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

FF FH

N o te : n r a n g e s fr o m 0 to F

01 8H

E x t e r nal i nt er r u pt 1 s ubr o u t i ne

00C H

T i m e B a s e In te r r u p t

R T C In te r r u p t

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

n00H

nF F H

T i m e r / ev ent c ou nt er 1 i nt e r r u pt s u b r o u t i n e

010H

Program memory

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