MITSUBISHI MICROCOMPUTERS
M37274EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
MEMORY
Interrupt Vector Area
The interrupt vector area contains reset and interrupt vectors.
Special Function Register (SFR) Area
The special function register (SFR) area in the zero page contains
control registers such as I/O ports and timers.
Zero Page
The 256 bytes from addresses 000016 to 00FF16 are called the zero
page area. The internal RAM and the special function registers (SFR)
are allocated to this area.
RAM
RAM is used for data storage and for stack area of subroutine calls
and interrupts.
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.
ROM
ROM is used for storing user programs as well as the interrupt vector
area.
Special Page
The 256 bytes from addresses FF0016 to FFFF16 are called the spe-
cial page area. The special page addressing mode can be used to
specify memory addresses in the special page area. Access to this
area with only 2 bytes is possible in the special page addressing
mode.
RAM for OSD
RAM for display is used for specifying the character codes and col-
ors to display.
ROM for OSD
ROM for display is used for storing character data.
ROM Correction Memory (RAM)
This is used as the program area for ROM correction.
000016
1000016
Not used
1080016
Zero page
00C016
00FF16
SFR1 area
010016
020016
024816
RAM
(1024 bytes)
SFR2 area
Not used
155FF16
Not used
02C016
ROM correction memory
Block 1 : addresses 02C016 to 02DF16
Block 2 : addresses 02E016 to 02FF16
1800016
02FF16
030016
ROM for OSD
(11072 bytes)
053F16
Not used
Not used
080016
0FF716
RAM for OSD (Note)
(1920 bytes)
100016
ROM
(60 K bytes)
1E41F16
1FFFF16
Not used
FF0016
FFDE16
Special page
Interrupt vector area
FFFF16
Note : Refer to Table 13. Contents of OSD RAM.
Fig. 4. Memory map
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RENESAS [ RENESAS TECHNOLOGY CORP ]
