38C3 datasheet(8/63 Pages) RENESAS

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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

38C3 Group

Not available

Processor mode bits

b1 b0

0 : Single-chip mode

1 :

0 :

1 :

Stack page selection bit

0 : RAM in the zero page is used as stack area

1 : RAM in page 1 is used as stack area

Not used (returns “1” when read)

(Do not write “0” to this bit.)

Port XC switch bit

0 : I/O port

1 : XCIN, XCOUT

Main clock ( XIN–XOUT) stop bit

0 : Operating

1 : Stopped

Main clock division ratio selection bit

0 : f(XIN)/2 (high-speed mode)

1 : f(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)

CPU mode register

(CPUM (CM) : address 003B 16)

FUNCTIONAL DESCRIPTION

CENTRAL PROCESSING UNIT (CPU)

The 38C3 group uses the standard 740 family instruction set. Refer

to the table of 740 family addressing modes and machine instruc-

tions 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.

Fig. 5 Structure of CPU mode register

38C3 Datasheet(PDF) 8 Page - Renesas Technology Corp

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