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| 型號： | HMS81024E |
| 廠商： | Hynix Semiconductor Inc. |
| 元件分類： | 8位微控制器 |
| 英文描述： | HYNIX SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | Hynix半導(dǎo)體公司的8位單芯片微控制器 |
| 文件頁數(shù)： | 22/77頁 |
| 文件大小： | 1112K |
| 代理商： | HMS81024E |
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HMS81004E/08E/16E/24E/32E
JUNE 2001 Ver 1.00
19
8.2 Program Memory
A 16-bit program counter is capable of addressing up to
64K bytes, but this device has 4/8/16/24/32K bytes pro-
gram memory space only physically implemented. Ac-
cessing a location above FFFF
H
will cause a wrap-around
to 0000
H
.
Figure 8-5 , shows a map of Program Memory. After reset,
the CPU begins execution from reset vector which is stored
in address FFFE
H
and FFFF
H
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: 0FFC0
H
for TCALL15, 0FFC2
H
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 0FFFA
H
. The interrupt service locations spaces 2-byte
interval: 0FFF8
H
and 0FFF9
H
for External Interrupt 1,
0FFFA
H
and 0FFFB
H
for External Interrupt 0, etc.
Any area from 0FF00
H
to 0FFFF
H
, if it is not going to be
used, its service location is available as general purpose
Program Memory.
Figure 8-6 Interrupt Vector Area
TCALL
AREA
INTERRUPT
VECTOR AREA
FF00
H
FFC0
H
FFE0
H
FFFF
H
PCALL
AREA
A000
H
8000
H
F000
H
E000
H
C000
H
H
4
H
8
H
K
H
2
H
3
LDA
#5
TCALL 0FH
:
:
;
1BYTE INSTRUCTION
;
INSTEAD OF 2 BYTES
;
NORMAL CALL
;
;TABLE CALL ROUTINE
;
FUNC_A: LDA
RET
;
FUNC_B: LDA
RET
;
;TABLE CALL ADD. AREA
;
ORG
DW
DW
LRG0
LRG1
0FFC0H
FUNC_A
FUNC_B
;
TCALL ADDRESS AREA
1
2
E0
E2
E4
E6
E8
EA
EC
EE
F0
Address
Vector Area Memory
F2
F4
F6
F8
FA
FC
FE
-
-
-
Basic Interval Timer Interrupt Vector Area
Watch Dog Timer Interrupt Vector Area
-
-
Timer2 Interrupt Vector Area
Timer1 Interrupt Vector Area
Timer0 Interrupt Vector Area
-
External Interrupt 2 Vector Area
External Interrupt 1 Vector Area
Key Scan Interrupt Vector Area
-
RESET Vector Area
"-" means reserved area.
NOTE:
0FFDE
H
S/W Interrupt Vector Area
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