參數(shù)資料
型號(hào)： HMS81C43XX
廠商： Hynix Semiconductor Inc.
英文描述： CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR TELEVISION
中文描述： CMOS單芯片8位單片機(jī)電視
文件頁(yè)數(shù)： 21/100頁(yè)
文件大?。?/td> 1943K
代理商： HMS81C43XX
HMS81C43xx / GMS87C4060
21
November 2001 ver 1.2
8.2 Program Memory
A 16-bit program counter is capable of addressing up to
64K bytes, but HMS81C43xx/GMS87C4060 has 8~32K/
60K bytes program memory space only physically imple-
mented. 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 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 0FFFC
H
. The interrupt service locations spaces 2-byte
interval: 0FFF8
H
and 0FFF9
H
for External Interrupt 1,
0FFFC
H
and 0FFFD
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
PROGRAM
MEMORY
TCALL
AREA
INTERRUPT
VECTOR AREA
87C4060:1000H
FEFFH
FF00H
FFC0H
FFDFH
FFE0H
FFFFH
PCALL
AREA
81C4332:8000H
FFBFH
81C4324:A000H
81C4316:C000H
81C4308:E000H
LDA
TCALL 0FH
:
:
#5
;
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
0FFE0
H
E2
E4
E6
E8
EA
EC
EE
F0
Address
Vector Area Memory
F2
F4
F6
F8
FA
FC
FE
I
2
C Bus Interface Interrupt Vector Area
Serial I/O Interrupt Vector Area
Basic Interval Timer Interrupt Vector Area
Watchdog Timer Interrupt Vector Area
External Interrupt 3/4 Vector Area
Timer/Counter 3 Interrupt Vector Area
Timer/Counter 1 Interrupt Vector Area
V-Sync Interrupt Vector Area
1 Frame Timer Interrupt Vector Area
Timer/Counter 2 Interrupt Vector Area
Timer/Counter 0 Interrupt Vector Area
External Interrupt 2 Vector Area
External Interrupt 1 Vector Area
On Screen Display Interrupt Vector Area
External Interrupt 0 Vector Area
RESET Vector Area
"-" means reserved area.
NOTE:
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