Renesas PCA4738F-80A Instrukcja Użytkownika Pobierz pdf (Strona 8)

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

38C3 Group

Not available

Processor mode bits

b1 b0

0 0 : Single-chip mode

0 1 :

1 0 :

1 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 X

switch bit

0 : I/O port

1 : X

CIN

, X

COUT

Main clock ( X

–X

OUT

) stop bit

0 : Operating

1 : Stopped

Main clock division ratio selection bit

0 : f(X

)/2 (high-speed mode)

1 : f(X

)/8 (middle-speed mode)

Internal system clock selection bit

0 : X

-X

OUT

selected (middle-/high-speed mode)

1 : X

CIN

-X

COUT

selected (low-speed mode)

CPU mode register

(CPUM (CM) : address 003B

)

b7 b0

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 003B

16.

Fig. 5 Structure of CPU mode register

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 63 64

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