GMS82512 datasheet(21/93 Pages) HYNIX

21 / 93 page

GMS82512/16/24

HYUNDAI MicroElectronics

FEB. 2000 Ver 1.00

8.2 Program Memory

A 16-bit program counter is capable of addressing up to

64K bytes, but this device has 24K bytes program memory

space only physically implemented. Accessing a location

above FFFFH will cause a wrap-around to 0000H.

Figure 8-5, shows a map of Program Memory. After reset,

the CPU begins execution from reset vector which is stored

in address FFFEH and FFFFH as shown in Figure 8-6.

As shown in Figure 8-5, each area is assigned a fixed loca-

tion in Program Memory. Program Memory area contains

the user program.

Figure 8-5 Program Memory Map

Page Call (PCALL) area contains subroutine program to

reduce program byte length by using 2 bytes PCALL in-

stead of 3 bytes CALL instruction. If it is frequently called,

it is more useful to save program byte length.

Table Call (TCALL) causes the CPU to jump to each

TCALL address, where it commences the execution of the

service routine. The Table Call service area spaces 2-byte

for every TCALL: 0FFC0H for TCALL15, 0FFC2H for

TCALL14, etc., as shown in Figure 8-7.

Example: Usage of TCALL

The interrupt causes the CPU to jump to specific location,

where it commences the execution of the service routine.

The External interrupt 0, for example, is assigned to loca-

tion 0FFFAH. The interrupt service locations spaces 2-byte

interval: 0FFF8H and 0FFF9H for External Interrupt 1,

0FFFAH and 0FFFBH for External Interrupt 0, etc.

Any area from 0FF00H to 0FFFFH, if it is not going to be

used, its service location is available as general purpose

Program Memory.

Figure 8-6 Interrupt Vector Area

Interrupt

Vector Area

C000H

FEFFH

FF00H

FFC0H

FFDFH

FFE0H

FFFFH

D000H

A000H

TCALL area

0FFE0H

Address

Vector Area Memory

Basic Interval Timer

External Interrupt 2

Timer/Counter 1 Interrupt

External Interrupt 0

RESET Vector Area

External Interrupt 1

Watchdog Timer Interrupt

“-” means reserved area.

NOTE:

Timer/Counter 2 Interrupt

External Interrupt 3

Timer/Counter 0 Interrupt

Timer/Counter 3 Interrupt

A/D Converter

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