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| 型號： | ST623X-KIT |
| 英文描述： | 8 MBIT (X8, BLOCK ERASE) FLASH MEMORY |
| 中文描述： | 入門套件小冊子的ST6230 |
| 文件頁數(shù)： | 8/86頁 |
| 文件大小： | 531K |
| 代理商： | ST623X-KIT |
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ST62T30B ST62E30B
1.3 MEMORY MAP
1.3.1 Introduction
The MCU operates in three separate memory
spaces: Program space, Data space, and Stack
space. Operationin these three memory spaces is
described in the following paragraphs.
Briefly, Program space contains user program
code in Program memory and user vectors; Data
space contains user data in RAM and in Program
memory, and Stack space accommodates six lev-
els of stack for subroutine and interrupt service
routine nesting.
1.3.2 Program Space
Program Space comprises the instructions to be
executed, the data required for immediate ad-
dressing mode instructions, the reserved factory
test area and the user vectors. Program Space is
addressed via the 12-bit ProgramCounter register
(PC register).
Program Space is organised in four 2K pages.
Three of them are addressedin the 000h-7FFhlo-
cations of the Program Space by the Program
Counter and by writing the appropriate code in the
Program ROM Page Register (PRPR register). A
common (STATIC) 2K page is available all the
time for interrupt vectors and common subrou-
tines, independently of the PRPR register content.
This “STATIC” page is directly addressed in the
0800h-0FFFh by the MSB of the ProgramCounter
register PC 11. Note this page can also be ad-
dressed in the 000-7FFh range. It is two different
ways of addressing the same physical memory.
Jump from a dynamic page to another dynamic
page is achieved by jumping back to the static
page, changing contents of PRPR and then jump-
ing to the new dynamic page.
Figure 3. 8Kbytes Program Space Addressing
Figure 4. Memory Addressing Diagram
PC
SPACE
000h
7FFh
800h
FFFh
0000h
1FFFh
Page 0
Page 1
Static
Page
Page 2
Page 3
Page 1
Static
Page
ROM SPACE
PROGRAM SPACE
PROGRAM
MEMORY
INTERRUPT &
RESET VECTORS
ACCUMULATOR
DATA RAM
BANK SELECT
WINDOW SELECT
RAM
X REGISTER
Y REGISTER
V REGISTER
W REGISTER
DATA READ-ONLY
MEMORY
WINDOW
RAM / EEPROM
BANKING AREA
000h
03Fh
040h
07Fh
080h
081h
082h
083h
084h
0C0h
0FFh
0-63
DATA SPACE
0000h
0FF0h
0FFFh
MEMORY
DATA READ-ONLY
VR01568
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