M38270E1-XXXFP View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M38270E1-XXXFP

Single-chip 8-bit CMOS microcomputer. PROM 61440 bytes, RAM 2048 bytes. One time PROM version.

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

3827 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

FUNCTIONAL DESCRIPTION

Central Processing Unit (CPU)

The 3827 group uses the standard 740 family instruction set. Re-

fer to the table of 740 family addressing modes and machine

instructions or the 740 Family Software Manual for details on the

instruction set.

Machine-resident 740 family instructions are as follows:

The FST and SLW instruction cannot be used.

The STP, WIT, MUL, and DIV instruction can be used.

[CPU Mode Register (CPUM)] 003B16

The CPU mode register contains the stack page selection bit and

the internal system clock selection bit.

The CPU mode register is allocated at address 003B16.

b7

Fig. 6 Structure of CPU mode register

b0

CPU mode register

(CPUM (CM) : address 003B16)

Processor mode bits

b1 b0

0 0 : Single-chip mode

0 1:

1 0 : Not available

1 1:

Stack page selection bit

0 : 0 page

1 : 1 page

Not used (returns “1” when read)

(Do not write “0” to this bit.)

Port XC switch bit

0 : Stop oscillating

1 : XCIN, XCOUT

Main clock ( XIN-XOUT) stop bit

0 : Oscillating

1 : Stopped

Main clock division ratio selection bit

0 : XIN/2 (high-speed mode)

1 : XIN/8 (middle-speed mode)

Internal system clock selection bit

0 : XIN-XOUT selected (middle-/high-speed mode)

1 : XCIN-XCOUT selected (low-speed mode)

8

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