M37224M3-XXXSP View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M37224M3-XXXSP

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

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

M37224M3-XXXSP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER

with ON-SCREEN DISPLAY CONTROLLER

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 Display

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

ors to display.

ROM for Display

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

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

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.

000016

RAM

(256 bytes)

RAM

for display

(Note)

(80 bytes)

00C016

00FF16

013F16

021716

021B16

02C016

02FF16

060016

06B316

SFR area

Not used

2 page register

Not used

Not used

Not used

D00016

Zero page

ROM

for display

(4K bytes)

1000016

10FFF16

ROM correction memory (RAM)

Block 1: addresses 02C0 16 to 02DF16

Block 2: addresses 02E0 16 to 02FF16

Not used

ROM

(12K bytes)

FF0016

FFDE16

FFFF16

Interrupt vector area

Fig. 4. Memory Map

Special page

1FFFF16

Note: Refer to Table 8. Contents of CRT display RAM.

9

Share Link: