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| 型號： | GMS82524T |
| 英文描述： | [General Purpose(1) : ADC/ LED/ SCI/ PWM] |
| 中文描述： | [通用（1）：藝術(shù)發(fā)展局/發(fā)光/工商/脈寬調(diào)制] |
| 文件頁數(shù)： | 27/110頁 |
| 文件大?。?/td> | 1980K |
| 代理商： | GMS82524T |
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GMS81508B/16B/24B, GMS82512/16/24
24
MAY. 2001 Ver 2.0
8.2 Program Memory
A 16-bit program counter is capable of addressing up to
64K bytes, but this device has 24K bytes program memory
space only physically implemented. Accessing 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 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: 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
Interrupt
Vector Area
D000
H
FEFF
H
FF00
H
FFC0
H
FFDF
H
FFE0
H
FFFF
H
P
E000
H
C000
H
TCALL area
G
G
G
G
A000
H
~
~
0FFE0
H
E2
E4
E6
E8
EA
EC
EE
F0
F2
F4
F6
F8
FA
FC
FE
Address
Vector Area Memory
-
-
*
Serial Communication Interface
Basic Interval Timer
Watchdog Timer Interrupt
A/D Converter
-
-
-
External Interrupt 2
External Interrupt 1
Timer/Counter 1 Interrupt
Timer/Counter 0 Interrupt
External Interrupt 0
-
RESET Vector Area
“
” is NOT served on GMS825xx.
“-” means reserved area.
Timer/Counter 2 Interrupt
External Interrupt 3
Timer/Counter 3 Interrupt
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