M37544 RENESAS [Renesas Technology Corp], M37544 Datasheet - Page 13

• Manufacturer Part Number: M37544
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
• Manufacturer: RENESAS [Renesas Technology Corp]

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.
Rev.1.04
REJ03B0012-0104Z
7544 Group
Fig. 13 Memory map diagram
ROM area
ROM capacity
2004.06.08
(bytes)
8192
RAM area
RAM capacity
E000
address
YYYY
page 13 of 66
(bytes)
256
16
16
XXXX
E080
address
013F
address
ZZZZ
16
16
16
16
RAM
ROM
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.
The content of RAM is undefined when the microcomputer is re-
set. The initial values must be surely set before you use it.
XXXX
YYYY
FFDC
FFFE
ZZZZ
FFFF
FF00
0000
0040
0440
0100
Note on use
16
16
16
16
16
16
16
16
16
16
16
Reserved ROM area
Reserved ROM area
Interrupt vector area
Reserved area
(128 bytes)
SFR area
Disable
16
16
Zero page
Special page
to 00FF
to FFFF
16
16
are called the
are called the