M37640E8FP 데이터 시트보기 (PDF) - Mitsumi

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M37640E8FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Mitsumi 

Ver 1.4

MITSUBISHI MICROCOMPUTERS

7640 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

1.12 PROCESSOR MODES

The operation modes are described below. The memory

maps for the first three modes are shown in Figure 1.8.

Single chip mode is normally entered after reset. How-

ever, if the MCU has a CNVss pin, holding this pin high

will cause microprocessor mode to be entered after re-

set. After the reset sequence has completed, the mode

can be changed with software by modifying the value of

bits 0 and 1 of CPMA. However, while CNVss is high,

bit 1 of CPMA is “1” and cannot be changed.

0000

0007

0008

000F

0010

006F

0070

00FF

0100

046F

0470

Single Chip

Mode

CPMA, CPMB and

Int Registers

P0 - P3

Internal RAM

(Zero Page)

Internal RAM

Memory

Expansion Mode

0000

CPMA, CPMB and

0007

0008

SFR

Int Registers

External Memory

SFR

000F

0010

006F

0070

00FF

0100

046F

0470

Internal RAM

(Zero Page)

Internal RAM

Microprocessor

Mode

0000

CPMA, CPMB and

0007

0008

Int Registers

External Memory

SFR

000F

0010

006F

0070

00FF

0100

046F

0470

Internal RAM

(Zero Page)

Internal RAM

Inaccessible Area

External Memory

External Memory

7FFF

8000

807F

8080

FFC9

FFCA

FFFB

FFFC

FFFF

Reserved Area

ROM

Interrupt Vectors

Reserved Area

7FFF

8000

807F

8080

FFC9

FFCA

FFFB

FFFC

FFFF

Fig. 1.8. Operation Modes Memory Maps

Reserved Area

ROM

Interrupt Vectors

Reserved Area

FFFF

9

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