V850ESLASHME2 datasheet(72/226 Pages) NEC

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CHAPTER 5 INSTRUCTIONS

User’s Manual U14559EJ3V1UM

Divide halfword

DIVH

Divide Halfword

Instruction format

(1) DIVH reg1, reg2

(2) DIVH reg1, reg2, reg3

Operation

(1) GR [reg2]

← GR [reg2] ÷ GR [reg1]

(2) GR [reg2]

← GR [reg2] ÷ GR [reg1]

GR [reg3]

← GR [reg2] % GR [reg1]

Format

(1) Format I

(2) Format XI

Opcode

(1)

rrrrr000010RRRRR

(2)

rrrrr111111RRRRR

wwwww01010000000

Flag

–

1 if overflow occurs; otherwise, 0.

1 if the result of an operation is negative; otherwise, 0.

1 if the result of an operation is 0; otherwise, 0.

SAT

–

Explanation

(1) Divides the word data of general-purpose register reg2 by the lower halfword data of

general-purpose register reg1, and stores the quotient in general-purpose register reg2. If

the data is divided by 0, overflow occurs, and the quotient is undefined.

The data of

general-purpose register reg1 is not affected.

(2) Divides the word data of general-purpose register reg2 by the lower halfword data of

general-purpose register reg1, and stores the quotient in general-purpose register reg2

and the remainder in general-purpose register reg3. If the data is divided by 0, overflow

occurs, and the quotient is undefined. The data of general-purpose register reg1 is not

affected.

Remark

(1) The remainder is not stored.

Overflow occurs when the maximum negative value

(80000000H) is divided by –1 (in which case the quotient is 80000000H) and when data is

divided by 0 (in which case the quotient is undefined). If an interrupt occurs while this

instruction is being executed, execution is aborted, and the interrupt is serviced. Upon

returning from the interrupt, the execution is restarted from the beginning, with the return

address being the address of this instruction. Also, general-purpose registers reg1 and

reg2 will retain their original values prior to the start of execution.

Do not specify r0 as the destination register reg2.

The higher 16 bits of general-purpose register reg1 are ignored when division is executed.

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