GMS87C1102 datasheet(31/89 Pages) HYNIX

31 / 89 page

GMS81C1102 / GMS81C1202

Jan. 2002 ver 2.0

12.2 Program Memory

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

64K bytes, but this device has 2K bytes program memory

space only the physically implemented. Accessing a loca-

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

Figure 12-4 shows a map of the upper part of the Program

Memory. After reset, the CPU begins execution from reset

vector which is stored in address FFFEH, FFFFH.

As shown in Figure 12-4, each area is assigned a fixed lo-

cation in Program Memory. Program Memory area con-

tains the user program, Page Call (PCALL) area contains

subroutine program, to reduce program byte length be-

cause of using by 2 bytes PCALL instead of 3 bytes CALL

instruction. If it is frequently called, more useful to save

program byte length.

Figure 12-4 Program Memory Map

The Device Configuration Area can be programmed or left

unprogrammed to select device configuration such as RC

oscillation option. This area is not accessible during nor-

mal execution but is readable and writable during program

/ verify.

More detail informations are explained in device configu-

ration area section.

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

TCALL address, where it commences execution of the

service routine. The Table Call service locations are

spaced at 2-byte interval : FFC0H for TCALL15, FFC2H

for TCALL14, etc.

The interrupt causes the CPU to jump to specific location,

where it commences execution of the service routine. The

External interrupt 0, for example, is assigned to location

FFFAH. The interrupt service locations are spaced at 2-

byte interval : FFF8H for External Interrupt 1, FFFAH for

External Interrupt 0, etc.

As for the area from FF00H to FFFFH, if any area of them

is not going to be used, its service location is available as

general purpose Program Memory.

Page Call (PCALL) area contains subroutine program to

PROGRAM

MEMORY

PCALL

AREA

TCALL

AREA

INTERRUPT

VECTOR AREA

F800H

FEFFH

FF00H

FFBFH

FFC0H

FFDFH

FFE0H

FFFFH

DEVICE

NOT USED

0F50H

0FF0H

CONFIG

CONFIGURATION

AREA

0F60H

0F70H

0F80H

0F90H

0FA0H

0FB0H

0FC0H

0FD0H

0FE0H

Address

TCALL Name

FFC0H

FFC2H

FFC4H

FFC6H

FFC8H

FFCAH

FFCCH

FFCEH

FFD0H

FFD2H

FFD4H

FFD6H

FFD8H

FFDAH

FFDCH

FFDEH

TCALL15

TCALL14

TCALL13

TCALL12

TCALL11

TCALL10

TCALL9

TCALL8

TCALL7

TCALL6

TCALL5

TCALL4

TCALL3

TCALL2

TCALL1

TCALL0 / BRK 1

The BRK software interrupt is using same address

with TCALL0.

Table 12-1 TCALL Vectors

Address

Vector Name

FFE0H

FFE2H

FFE4H

FFE6H

FFE8H

FFEAH

FFECH

FFEEH

FFF0H

FFF2H

FFF4H

FFF6H

FFF8H

FFFAH

FFFCH

FFFEH

Not Used

Basic Interval Timer

Watchdog Timer

A/D Converter

Not Used

Timer / Counter 1

Timer / Counter 0

External Interrupt 1

External Interrupt 0

Not Used

RESET

Table 12-2 Interrupt Vectors

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