7641_06 Datasheet, PDF (30/385 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

7641 Group
HARDWARE
FUNCTIONAL DESCRIPTION
MEMORY
Special Function Register (SFR) Area
The Special Function Register area in the zero page contains control
registers such as I/O ports and timers.
RAM
RAM is used for data storage and for stack area of subroutine calls
and interrupts.
ROM
The first 128 bytes and the last 4 bytes of ROM are reserved for
device testing and the rest is user area for storing programs. In the
flash memory version, program and erase can be performed in the
reserved area.
Interrupt Vector Area
The interrupt vector area contains reset and interrupt vectors.
Zero Page
Access to this area with only 2 bytes is possible in the zero page
addressing mode.
Special Page
Access to this area with only 2 bytes is possible in the special page
addressing mode.
Refer to page 74 for the memory map of memory expansion and
microprocessor modes.
RAM area
M37641M8
M37641F8
RAM size
(bytes)
1024
2560
Address
XXXX16
046F16
0A6F16
000016
007016
SFR area
RAM
010016
XXXX16
100016
Reserved area (Note 1)
Zero page
Not used
800016
808016
Reserved ROM area
(128 bytes)
Fig. 9 Memory map diagram
ROM
SIZE: 32768 bytes
FF0016
FFC916
FFCA16
FFFC16
FFFF16
(Note 2)
SFR area
Interrupt vector area
Reserved ROM area
Special page
Notes 1: Reserved area in M37641F8.
2: SFR area in M37641F8.
Rev.2.00 Aug 28, 2006 page 13 of 113
REJ09B0336-0200