M37640E8 View Datasheet(PDF) - MITSUBISHI ELECTRIC

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M37640E8

Single-Chip 8-BIT CMOS Microcontroller M37640E8-XXXFP Specification

MITSUBISHI ELECTRIC  

7600 Series

M37640E8-XXXF Preliminary Specification

Mitsubishi Microcomputers

2.4 Memory Map

Zero Page

SFR Area

RAM

1K bytes

Not Used

000016

006F16

007016

00FF16

010016

046F16

047016

Reserved Area

7FFF16

800016

807F16

808016

ROM

32K bytes

FEFF16

FF0016

Special page for

subroutine calls

FFC916

FFCA16

Reserved Area

FFFB16

FFFC16

FFFF16

Figure 2-13. Memory Map

The first 112 bytes of memory from 000016 to 006F16 is the special function register (SFR) area and

contains the CPU mode registers, interrupt registers, and other registers to control peripheral functions

(see Figure 2-13.).

The general purpose RAM resides from 007016 to 046F16. When the MCU is in memory expansion

or microprocessor mode and external memory is overlaid 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 accessing the internal ROM.

Zero page and special page area can be accessed by 2-byte commands by using special addressing

modes.

2-14

7/9/98

Memory Map

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