GMS87C4060 datasheet(21/100 Pages) HYNIX

21 / 100 page

HMS81C43xx / GMS87C4060

November 2001 ver 1.2

8.2 Program Memory

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

64K bytes, but HMS81C43xx/GMS87C4060 has 8~32K/

60K bytes program memory space only physically imple-

mented. 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 lo-

cation in Program Memory. Program Memory area con-

tains 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 0FFFCH. The interrupt service locations spaces 2-byte

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

0FFFCH and 0FFFDH 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

PROGRAM

MEMORY

TCALL

AREA

INTERRUPT

VECTOR AREA

87C4060:1000H

FEFFH

FF00H

FFC0H

FFDFH

FFE0H

FFFFH

PCALL

AREA

81C4332:8000H

FFBFH

81C4324:A000H

81C4316:C000H

81C4308:E000H

LDA

TCALL

0FH

;

1 BYTE IN ST R U C T IO N

IN STEAD O F 2 BYTES

NO RM A L C A L L

;

;TABLE CALL ROUTINE

;

FUNC_A:

LDA

LRG0

RET

;

FUNC_B:

LDA

LRG1

RET

;

;TABLE CALL ADD. AREA

;

ORG

0FFC0H

;

TC AL L AD D R E SS AR EA

FUNC_A

FUNC_B

0FFE0H

Address

Vector Area Memory

I2C Bus Interface Interrupt Vector Area

Serial I/O Interrupt Vector Area

Basic Interval Timer Interrupt Vector Area

Watchdog Timer Interrupt Vector Area

Timer/Counter 3 Interrupt Vector Area

Timer/Counter 1 Interrupt Vector Area

V-Sync Interrupt Vector Area

Timer/Counter 2 Interrupt Vector Area

Timer/Counter 0 Interrupt Vector Area

External Interrupt 2 Vector Area

On Screen Display Interrupt Vector Area

External Interrupt 0 Vector Area

RESET Vector Area

External Interrupt 1 Vector Area

1 Frame Timer Interrupt Vector Area

External Interrupt 3/4 Vector Area

"-" means reserved area.

NOTE:

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