M37225M6_15 datasheet(14/128 Pages) RENESAS

Part #	M37225M6

Description	SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

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Manufacturer	RENESAS [Renesas Technology Corp]

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14 / 128 page

M37225M6/M8/MA/MC-XXXSP, M37225ECSP

Rev.1.00

Nov 01, 2000

page 12 of 124

REJ03B0136-0100Z

8.2 MEMORY

8.2.1 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.

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 for display is used for specifying the character codes and col-

ors to display.

8.2.5 OSD ROM

ROM for display is used for storing character data.

8.2.6 Interrupt Vector Area

The interrupt vector area contains reset and interrupt vectors.

8.2.7 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

register addresses in the zero page area. Access to this area with

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

8.2.8 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.

8.2.9 ROM Correction Vector

This is used as the program jump destination addresses for ROM

correction.

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