GMS87C1102 datasheet(32/89 Pages) HYNIX

tên linh kiện	GMS87C1102

Giải thích chi tiết về linh kiện	8-BIT SINGLE-CHIP MICROCONTROLLERS

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nhà sản xuất	HYNIX [Hynix Semiconductor]

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GMS81C1102 / GMS81C1202

Jan. 2002 ver 2.0

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 12-5 .

Example: Usage of TCALL

Figure 12-5 PCALL and TCALL Memory Area

LDA

TCALL

0FH

;

1BYTE INSTR UCTIO N

INSTEAD 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

;

TCALL ADDRESS AREA

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 *

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