M37221EASP datasheet(13/112 Pages) RENESAS

13 / 112 page

M37221M4H/M6H/M8H/MAH–XXXSP/FP M37221EASP/FP

Rev.1.00

Oct 01, 2002

page 13 of 110

REJ03B0134-0100Z

8.2 MEMORY

8.2.1 Special Function Register (SFR) Area

The special function register (SFR) area in the zero page includes

control registers such as I/O ports and timers.

8.2.2 RAM

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

and interrupts.

8.2.3 ROM

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

area.

8.2.4 OSD RAM

RAM used for specifying the character codes and colors for display.

8.2.5 OSD ROM

ROM used for storing character data for display.

8.2.6 Interrupt Vector Area

The interrupt vector area contains reset and interrupt vectors.

8.2.7 Zero Page

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

sible with only 2 bytes in the zero page addressing mode.

8.2.8 Special Page

The special page addressing mode can be used to specify memory

addresses in the special page area. Access to this area is possible

with only 2 bytes in the special page addressing mode.

8.2.9 ROM Correction Memory (RAM)

This is used as the program area for ROM correction.

Fig. 8.2.1 Memory Map (M37221M4H/M6H-XXXSP/FP)

000016

00C016

00FF16

01BF16

06B716

A00016

SFR area

Not used

FFFF16

FFDE16

FF0016

060016

Interrupt vector area

Not used

1000016

11FFF16

1FFFF16

OSD ROM

(8K bytes)

Special page

OSD RAM

(96 bytes)

(See note)

Zero page

Note: Refer to Table 8.11.4 OSD RAM.

■ M37221M4 H/M6H -XXXSP/FP

C00016

017F16

M37221M6H-

XXXSP/FP

RAM

(448 bytes)

ROM

(16K bytes)

ROM

(24K bytes)

M37221M6H-

XXXSP/FP

M37221M4H-

XXXSP/FP

02FF16

02C016

02E016

ROM correction function

Vector 1: address 02C016

Vector 2: address 02E016

M37221M4H-

XXXSP/FP

RAM

(384 bytes)

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