參數(shù)資料
型號: M37640E8FP
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 單芯片8位CMOS微機
文件頁數(shù): 8/96頁
文件大?。?/td> 1477K
代理商: M37640E8FP
8
Ver 1.4
MITSUBISHI MICROCOMPUTERS
7640 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
1.11 MEMORY MAP
The first 112 bytes of memory from 0000
16
to 006F
16
is the special function register (SFR) area and con-
tains the CPU mode registers, interrupt registers, and
other registers to control peripheral functions (see
Figure 1.7).
The general purpose RAM resides from 0070
16
to
046F
16.
When the MCU is in memory expansion or
microprocessor mode and external memory is over-
laid on the internal RAM, the CPU reads data from
the internal RAM. However, the CPU writes data in
both the internal and external memory. The area from
0470
16
to 7FFF
16
is not used in single-chip mode, but
can be mapped for an external memory device when
the MCU is in memory expansion or microprocessor
mode.
The area from 8000
16
to 807F
16
and from FFFC
16
to
FFFF
16
are factory reserved areas. Mitsubishi uses it
for test and evaluation purposes. The user can not
use this area in single-chip or memory expansion
modes.
The user 32K byte ROM resides from 8080
16
to
FFFB
16.
When the MCU is in microprocessor mode,
the CPU accesses an external area rather than ac-
cessing the internal ROM.
1.11.1 Special page
The 256 bytes from address FF00
16
to FFFF
16
are
called the special page area. In this area special page
addressing can be used to specify memory ad-
dresses. This dedicated special page addressing
mode enables access to this area with fewer instruc-
tion cycles. Frequently used subroutines are normally
stored in this area.
Fig. 1.7. Memory Map
SFR Area
Reserved Area
Zero Page
Special page for
subroutine calls
Not Used
Reserved Area
0000
16
006F
16
0070
16
00FF
16
0100
16
046F
16
0470
16
7FFF
16
8000
16
807F
16
8080
16
FEFF
16
FF00
16
FFC9
16
FFCA
16
FFFB
16
FFFC
16
FFFF
16
RAM
1K bytes
ROM
32K
Interrupt
Vector
bytes
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