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參數(shù)資料
| 型號： | MB90F949APF |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 20 MM, 3.35 MM HEIGHT, 0.65 MM PITCH, PLASTIC, QFP-100 |
| 文件頁數(shù)： | 3/57頁 |
| 文件大小： | 1586K |
| 代理商： | MB90F949APF |
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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
7544 Group
MITSUBISHI MICROCOMPUTERS
11
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Som
e parametric
limits
are
subject
to change.
Memory
Special function register (SFR) area
The SFR area in the zero page contains control registers such as
I/O ports and timers.
RAM
RAM is used for data storage and for a stack area of subroutine
calls and interrupts.
ROM
The first 128 bytes and the last 2 bytes of ROM are reserved for
device testing and the rest is a user area for storing programs.
Interrupt vector area
The interrupt vector area contains reset and interrupt vectors.
Zero page
The 256 bytes from addresses 000016 to 00FF16 are called the
zero page area. The internal RAM and the special function regis-
ters (SFR) are allocated to this area.
The zero page addressing mode can be used to specify memory
and register addresses in the zero page area. Access to this area
with only 2 bytes is possible in the zero page addressing mode.
Special page
The 256 bytes from addresses FF0016 to FFFF16 are called the
special page area. The special page addressing mode can be
used to specify memory addresses in the special page area. Ac-
cess to this area with only 2 bytes is possible in the special page
addressing mode.
s Notes on use
The content of RAM is undefined when the microcomputer is re-
set. The initial values must be surely set before you use it.
Fig. 11 Memory map diagram
010016
000016
004016
044016
FF0016
FFDC16
FFFE16
FFFF16
256
XXXX16
013F16
8192
E00016
E08016
YYYY16
ZZZZ16
RAM
ROM
Reserved area
SFR area
Not used
Interrupt vector area
ROM area
Reserved ROM area
(128 bytes)
Zero page
Special page
RAM area
RAM capacity
(bytes)
address
XXXX16
ROM capacity
(bytes)
address
YYYY16
Reserved ROM area
address
ZZZZ16
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