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參數(shù)資料
| 型號(hào)： | ST63E69D1 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 8-BIT HCMOS MCU FOR DIGITAL CONTROLLED MULTI FREQUENCYMONITOR |
| 中文描述： | 8位HCMOS單片機(jī)的數(shù)控多FREQUENCYMONITOR |
| 文件頁(yè)數(shù)： | 13/71頁(yè) |
| 文件大?。?/td> | 584K |
| 代理商： | ST63E69D1 |
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MEMORY SPACES
The MCUs operate in three different memory
spaces: Stack Space, Program Space and Data
Space. A description of these spaces is shown in
Figure 9.
Stack Space
The stack spaceconsists of six 12 bitregisters that
areused for stacking subroutineandinterrupt return
addressesplusthecurrentprogramcounterregister.
Program Space
The program space is physically implemented in
the ROMand includes all the instructionsthat are
to be executed,aswell as the datarequired forthe
immediate addressing mode instructions, the re-
served test area and user vectors. It is addressed
thanks to the 12-bit ProgramCounter register(PC
register) and so, the ST6369 Core can directlyad-
dress upto 4K bytesof ProgramSpace.Neverthe-
less, the Program Space can be extended by
the addition of 2-Kbyte ROM banks as it is shown
in Figure 11 in which a 8K bytes memory is de-
scribed. Thesebanks areaddressed bypointing to
the 000H-7FFH locations of the Program Space
thanks to the Program Counter, andby writingthe
appropriatecode in theProgram ROM Page Reg-
ister (PRPR) located at the CAH address of the
Data Space.Becauseinterrupts and commonsub-
PROGRAM SPACE
VR001568
INTERRUPT &
RESET VECTORS
ACCUMULATOR
W REGISTER
RAM
DATA ROM
WINDOW
RAM / EEPROM
BANKING AREA
DATA SPACE
DATA RAM
BANK SELECT
DATA ROM
WIND OW SELECT
V REGISTER
Y REGISTER
X REGISTER
0-63
0000h
07FFh
0800h
0FF0h
0FFFh
000h
03Fh
040h
070h
080h
081h
082h
083h
084h
0FFh
0C0h
ROM
ROM
STACK LEVEL 1
STACK LEVEL 2
STACK LEVEL 3
STACK LEVEL 4
STACK LEVEL 5
STACK LEVEL 6
PROGRAM COUNTER
STACK SPACE
Figure9. MemoryAddressing Description Diagram
routines should be available all the time only the
lower 2K byte of the 4K program space are bank
switched while the upper 2K byte can be seen as
static space. Table 3 gives the different codes that
allows the selection of the corresponding banks.
Note that,fromthe memorypointof view, the Page
1 and the StaticPage represent the same physical
memory: it isonly adifferent way of addressingthe
same location.
Program
counter
space
0000H
1FFFH
0FFFH
Static Page
Page 1
0800H
07FFH
Page 0
Page 1
Static Page
Page 2
Page 3
0000H
Figure 10. 8K Bytes Program Space Address-
ing Description
ST6369
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