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7542 Group
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.
The reserved ROM area can program/erase in the flash memory
version.
Interrupt vector area
The interrupt vector area contains reset and interrupt vectors.
RAM area
RAM capacity
ROM area
ROM capacity
address
(bytes)
YYYY
8192
E000
16384
C000
32768
8000
Fig. 15 Memory map diagram
Rev.3.02
Oct 31, 2006
REJ03B0006-0302
address
(bytes)
XXXX
16
384
01BF
16
512
023F
16
1024
043F
16
address
ZZZZ
16
16
E080
16
16
C080
16
16
8080
16
16
Notes 1: Only flash memory version has this SFR area.
2: The reserved ROM area can program/erase in the flash memory version.
Note the difference of the mask version.
Page 17 of 134
Zero page
The 256 bytes from addresses 0000
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 FF00
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.
0000
16
SFR area
0040
16
0100
16
RAM
XXXX
16
Reserved area
0440
16
0FE0
16
SFR area (Note 1)
0FFF
16
YYYY
16
Reserved ROM area
(128 bytes)
ZZZZ
16
ROM
FF00
16
FFDC
16
Interrupt vector area
FFFE
16
Reserved ROM area
FFFF
16
to 00FF
16
to FFFF
16
Zero page
Not used
Not used
Special page
are called the
16
are called the
16
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