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參數(shù)資料
| 型號(hào)： | GMS87C7216LQ |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 數(shù)學(xué)處理器 |
| 英文描述： | 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 8位單晶片微控制器 |
| 文件頁數(shù)： | 24/121頁 |
| 文件大?。?/td> | 1645K |
| 代理商： | GMS87C7216LQ |
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GMS81C7208/7216
20
FEB. 2005 Ver 1.04
8.2 Program Memory
A 16-bit program counter is capable of addressing up to 64K
bytes, but this device has 8K/16K 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 ad-
dress FFFE
H
and FFFF
H
as shown in Figure 8-6.
As shown in Figure 8-5, each area is assigned a fixed location in
Program Memory. Program Memory area contains the user pro-
gram.
Figure 8-5 Program Memory Map
Page Call (PCALL) area contains subroutine program to reduce
program byte length by using 2 bytes PCALL instead 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 ad-
dress, 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 location 0FFFA
H
. The in-
terrupt service locations spaces 2-byte interval: 0FFF8
H
and
0FFF9
H
for External Interrupt 1, 0FFFA
H
and 0FFFB
H
for Exter-
nal 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 Mem-
ory.
Figure 8-6 Interrupt Vector Area
Interrupt
Vector Area
C000
H
FEFF
H
FF00
H
FFC0
H
FFDF
H
FFE0
H
FFFF
H
P
E000
H
TCALL area
G
G
1
0FFE0
H
E2
E4
E6
E8
EA
EC
EE
F0
Address
Vector Area Memory
F2
F4
F6
F8
FA
FC
FE
Timer/Counter 3
Timer/Counter 2
Watch Timer
A/D Converter
Serial Peripheral Interface
-
-
External Interrupt 0
Watchdog Timer
Timer/Counter 1
Timer/Counter 0
Basic Interval Timer
Key Scan
RESET
“-” means reserved area.
NOTE:
External Interrupt 2
External Interrupt 1
-
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