GMS87C1102 datasheet(25/80 Pages) HYNIX

25 / 80 page

HYUNDAI MicroElectronics

GMS87C1102 / GMS87C1202

Oct. 1999 ver 1.0

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 11-5 .

Example: Usage of TCALL

Figure 11-5 PCALL and TCALL Memory Area

LDA

TCALL 0FH

;

1BYTE IN STRU C TIO N

INS TE AD O F 3 BYTES

NO RM AL CALL

;

;TABLE CALL ROUTINE

;

FUNC_A:

LDA

LRG0

RET

;

FUNC_B:

LDA

LRG1

RET

;

;TABLE CALL ADD. AREA

;

ORG

0FFC0H

;

TC ALL AD D RE SS AR EA

FUNC_A

FUNC_B

0FFC0H

Address

Program Memory

0FF00H

Address

PCALL Area Memory

0FFFFH

PCALL Area

(256 Bytes)

* means that the BRK software interrupt is using

same address with TCALL0.

NOTE:

TCALL 15

TCALL 14

TCALL 13

TCALL 12

TCALL 11

TCALL 10

TCALL 9

TCALL 8

TCALL 7

TCALL 6

TCALL 5

TCALL 4

TCALL 3

TCALL 2

TCALL 1

TCALL 0 / BRK *

GMS87C1102 Datasheet(PDF) 25 Page - Hynix Semiconductor

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