參數(shù)資料
型號： HMS81C20XXA-HK
廠商： Electronic Theatre Controls, Inc.
英文描述： CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver
中文描述： CMOS單芯片8位微控制器與A / D轉(zhuǎn)換器
文件頁數(shù)： 29/107頁
文件大?。?/td> 1482K
代理商： HMS81C20XXA-HK
HMS81C2012A/2020A
SEP. 2004 Ver 2.00
25
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 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
B000
H
TCALL area
H
H
LDA
#5
TCALL 0FH
:
:
;
1BYTE INSTRUCTION
;
INSTEAD OF 3 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
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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