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2-11

7220 Group User’s Manual

2.3 Memory assignment

FUNCTIONAL DESCRIPTION

2.3 Memory assignment

Figures 2.3.1 and 2.3.2 show the memory assignment. The ROM, RAM and I/O assigned in this memory

area are described below.

M37220M3-XXXSP/FP

Refer to “CHAPTER 4. M37220M3-XXXSP/FP.”

SFR area

Special function register

(Refer to Figures 2. 3. 3 and 2. 3. 4)

Not used

Interrupt vector area

Zero page

Special page

Internal RAM

RAM

for display

Internal ROM

Internal RAM

Decimal notation

255

383

1719

40960

65535

65502

65280

1536

192

49152

000016

00C016

00FF16

017F16

06B716

A00016

FFFF16

FF0016

060016

ROM

(16 K bytes)

for

M37221M4

CRT display RAM

(96 bytes)

(See note)

01BF16

RAM

(320 bytes)

for

M37221M4

C00016

ROM

(24 K bytes)

for

M37221M6

RAM

(384 bytes)

for

M37221M6

447

Not used

1000016

11FFF16

1FFFF16

Note: Refer to Table 2.11.4 Contents of CRT display RAM.

ROM

for display

65536

73727

131071

CRT display ROM

(8 K bytes)

Hexadecimal notation

010016

Fig. 2.3.1 Memory assignment of M37221M4-XXXSP and M37221M6-XXXSP/FP

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