HT48R50A datasheet(9/46 Pages) HOLTEK

9 / 46 page

HT48R50A-1

Rev. 1.10

July 2, 2001

· Location 004H

This area is reserved for the external inter-

rupt service program. If the INT input pin is

activated, the interrupt is enabled and the

stack is not full, the program begins execution

at location 004H.

· Location 008H

This area 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 enabled and the

stack is not full, the program begins execution

at location 008H .

· Location 00CH

This location is reserved for the Timer/Event

Counter 1 interrupt service program. If a

timer interrupt results from a Timer/Event

Counter 1 overflow, and the interrupt is en-

abled and the stack is not full, the program

begins execution at location 00CH.

· Table location

Any location in the program memory can be

used as look-up tables. The instructions

"TABRDC [m]" (the current page, one

page=256 words) and "TABRDL [m]" (the last

page) transfer the contents of the lower-order

byte to the specified data memory, and the

higher-order byte to TBLH (08H). Only the

Mode

Program Counter

*11 *10

Initial reset

00000000000

External interrupt

00000000010

Timer/Event Counter 0

overflow

00000000100

Timer/Event Counter 1

overflow

00000000110

Skip

PC+2

Loading PCL

*11 *10

Jump, call branch

#11 #10

Return from subroutine

S11 S10 S9

Program counter

Note: *11~*0: Program counter bits

S11~S0: Stack register bits

#11~#0: Instruction code bits

@7~@0: PCL bits

15 b i t s

FFF H

nFFH

P r ogr am

Me m o r y

D e vi ce I ni t i a l i za t i o n P r o g r a m

E x te r n a l Inte r r u p t S u b r o u ti ne

T i m e r / E v ent C ount e r 0

I nt e r r upt S ubr out i ne

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

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

00C H

n00H

008H

004H

000H

T i m e r / E v ent C ount e r 1

I nt e r r upt S ubr out i ne

Program memory

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