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GMS81C2112 Datasheet(PDF) 29 Page - Hynix Semiconductor

No. de Pieza. GMS81C2112
Descripción  HYNIX SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS
Descarga  107 Pages
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Fabricante  HYNIX [Hynix Semiconductor]
Página de inicio  http://www.skhynix.com/ko/index.jsp
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GMS81C2112 Datasheet(HTML) 29 Page - Hynix Semiconductor

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GMS81C2112/GMS81C2120
JUNE. 2001 Ver 1.00
23
8.2 Program Memory
A 16-bit program counter is capable of addressing up to
64K bytes, but this device has 20K 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
D000H
FEFFH
FF00H
FFC0H
FFDFH
FFE0H
FFFFH
B000H
TCALL area
LDA
#5
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
DW
FUNC_A
DW
FUNC_B
1
2
0FFE0H
E2
Address
Vector Area Memory
E4
E6
E8
EA
EC
EE
F0
F2
F4
F6
F8
FA
FC
FE
-
-
Serial Communication Interface
Basic Interval Timer
-
-
-
Timer/Counter 0 Interrupt
-
External Interrupt 0
-
RESET Vector Area
External Interrupt 1
Watchdog Timer Interrupt
"-" means reserved area.
NOTE:
Timer/Counter 1 Interrupt
-
A/D Converter


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