7480 datasheet(52/98 Pages) RENESAS

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MITSUBISHI MICROCOMPUTERS

7480/7481 GROUP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

PRELIMINAR

Notice:

This

is not

a final

specification.

Some

parametric

limits

are

subject

to change.

tents of the processor status register.

DATA REQUIRED FOR MASK ORDERING

Please submit the following data when placing mask orders.

(1) Mask ROM confirmation form

(2) Mark specification form

(3) ROM data .......................................................... EPROM 3 sets

DATA REQ UIRED FOR ROM WRITING

ORDERING

Please submit the following data when placing ROM writing or-

ders.

(1) ROM writing confirmation form

(2) Mark specification form

(3) ROM data .......................................................... EPROM 3 sets

ADDRESSING MODES

The 7480/7481 group has strong accessability, because it has 17

kinds of addressing modes. For details, refer to the 740 family ad-

dressing modes.

MACHINE-LANGUAGE INSTRUCTIONS

The 7480/7481 group has 71 machine-language instructions. For

details, refer to the 740 family machine-language instruction list.

NOTES ON PROGRAMMING

(1) The frequency division ratio of the timer is 1/(n+1).

n: Timer setting value

However, n = 0 – 255 (for timer 1, timer 2)

n = 0 – 65535 (timer X, timer Y)

(2) The contents of the interrupt request bits can be changed by

software, but the values will not change immediately after be-

ing overwritten.

After changing the value of the interrupt request bits, execute

at least one instruction before executing a the BBC or BBS in-

struction.

(3) To calculate in decimal notation, set the decimal mode flag (D)

to “1”. After executing the ADC or SBC instruction, execute

another instruction before executing the SEC, CLC, or CLD in-

struction.

(4) A NOP instruction should be executed after every PLP instruc-

tion.

(5) Do not execute the STP instruction during A-D conversion.

(6) Multiplication and Division Instructions

The index X mode (T) and the decimal mode (D) flags do not

affect the MUL and DIV instructions.

The execution of these instructions does not change the con-

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