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

1.11 MEMORY MAP

The first 112 bytes of memory from 000016 to 006F16

is the special function register (SFR) area and con-

tains the CPU mode registers, interrupt registers, and

other registers to control peripheral functions (see

Figure 1.7).

Zero Page

SFR Area

RAM

1K bytes

000016

006F16

007016

00FF16

010016

046F16

047016

Not Used

Special page for

subroutine calls

Reserved Area

7FFF16

800016

807F16

808016

ROM

32K bytes

FEFF16

FF0016

Interrupt

Vector

Reserved Area

FFC916

FFCA16

FFFB16

FFFC16

FFFF16

The general purpose RAM resides from 007016 to

046F16. When the MCU is in memory expansion or

microprocessor mode and external memory is over-

laid on the internal RAM, the CPU reads data from

the internal RAM. However, the CPU writes data in

both the internal and external memory. The area from

047016 to 7FFF16 is not used in single-chip mode, but

can be mapped for an external memory device when

the MCU is in memory expansion or microprocessor

mode.

The area from 800016 to 807F16 and from FFFC16 to

FFFF16 are factory reserved areas. Mitsubishi uses it

for test and evaluation purposes. The user can not

use this area in single-chip or memory expansion

modes.

The user 32K byte ROM resides from 808016 to

FFFB16. When the MCU is in microprocessor mode,

the CPU accesses an external area rather than ac-

cessing the internal ROM.

1.11.1 Special page

The 256 bytes from address FF0016 to FFFF16 are

called the special page area. In this area special page

addressing can be used to specify memory ad-

dresses. This dedicated special page addressing

mode enables access to this area with fewer instruc-

tion cycles. Frequently used subroutines are normally

stored in this area.

Fig. 1.7. Memory Map

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