M37274EFSP datasheet(12/148 Pages) RENESAS

12 / 148 page

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER

and ON-SCREEN DISPLAY CONTROLLER

M37274EFSP

PRELIMINARY

Notice:

This

is not

a final

specification.

Some

paramentic

limits

are

subject

to change.

MITSUBISHI MICROCOMPUTERS

MEMORY

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.

RAM

RAM is used for data storage and for stack area of subroutine calls

and interrupts.

ROM

ROM is used for storing user programs as well as the interrupt vector

area.

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.

Interrupt Vector Area

The interrupt vector area contains reset and interrupt vectors.

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.

The zero page addressing mode can be used to specify memory and

only 2 bytes is possible in the zero page addressing mode.

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.

ROM Correction Memory (RAM)

This is used as the program area for ROM correction.

Fig. 4. Memory map

000016

00C016

00FF16

0FF716

SFR1 area

FFFF16

FFDE16

FF0016

080016

Interrupt vector area

Special page

ROM

(60 K bytes)

RAM for OSD (Note)

(1920 bytes)

RAM

(1024 bytes)

Zero page

020016

024816

100016

SFR2 area

030016

053F16

02C016

02FF16

ROM correction memory

Block 1 : addresses 02C0 16 to 02DF16

Block 2 : addresses 02E0 16 to 02FF16

010016

Not used

ROM for OSD

(11072 bytes)

1080016

1FFFF16

155FF16

1800016

1E41F16

1000016

Note : Refer to Table 13. Contents of OSD RAM.

Not used

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