M38253E8MXXXFS Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

Номер в каталоге

Компоненты Описание

производитель

M38253E8MXXXFS

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

3825 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

FUNCTIONAL DESCRIPTION

CENTRAL PPROCESSING UNIT (CPU)

The 3825 group uses the standard 740 family instruction set. Refer

to the 740 Family Software Manual for details on the instruction set.

Machine-resident 740 family instructions are as follows:

The FST and SLW instructions cannot be used.

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

[CPU Mode Register (CPUM)] 003B16

The CPU mode register is allocated at address 003B16.

The CPU mode register contains the stack page selection bit

and the internal system clock selection bit.

b7

Fig. 8 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 : I/O port function (stop oscillating)

1 : XCIN–XCOUT oscillating function

Main clock (XIN–XOUT) stop bit

0 : Oscillating

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)

11

Share Link: