7220 datasheet(35/303 Pages) RENESAS

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2-8

FUNCTIONAL DESCRIPTION

2.2 Access area

7220 Group User’s Manual

2.2 Access area

The ROM, RAM and various I/O control registers are assigned within the same memory area. Therefore, the

same instructions are used for data transfers and arithmetic operations without making any distinction

between memory and I/O.

Since the program counter is a 16-bit register, 64 K-byte memory area can be accessed: from addresses

as 000016 to FFFF16.

The first 256 bytes of the 64 K-byte memory area are called the “zero page” and the last 256 bytes are

called the “special page.” These areas can be accessed with only 2 bytes by using each special addressing

mode.

M37220M3-XXXSP/FP

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

000016

00C016

00FF16

017F16

06B716

A00016

SFR area

Special function register

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

Not used

FFFF16

FFDE16

FF0016

060016

Interrupt vector area

Not used

1000016

11FFF16

1FFFF16

Zero page

CRT display ROM

(8 K bytes)

Special page

ROM

(16 K bytes)

for

M37221M4

CRT display RAM

(96 bytes)

(See note)

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

Internal RAM

RAM

for display

Internal ROM

Internal RAM

ROM

for display

: Internal ROM area for

program counter

01BF16

RAM

(320 bytes)

for

M37221M4

C00016

ROM

(24 K bytes)

for

M37221M6

RAM

(384 bytes)

for

M37221M6

Fig. 2.2.1 Access area of M37221M4-XXXSP and M37221M6-XXXSP/FP

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