4553 datasheet(86/145 Pages) RENESAS

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Rev.3.02

Dec 22, 2006

page 86 of 142

REJ03B0024-0302

4553 Group

MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)

OP2A (Output port P2 from Accumulator)

1000100010

222

–

Grouping:

Input/Output operation

Description: Outputs the contents of register A to port

P2.

Operation:

(P2)

← (A)

POF (Power OFf)

0000000010

002

–

Grouping:

Other operation

Description: Puts the system in clock operating mode by

executing the POF2 instruction after ex-

ecuting the EPOF instruction.

Note:

If the EPOF instruction is not executed before

executing this instruction, this instruction is

equivalent to the NOP instruction.

Operation:

Transition to clock operating mode

0000011001

019

–

Grouping:

Arithmetic operation

Description: Takes the OR operation between the con-

tents of register A and the contents of

M(DP), and stores the result in register A.

Operation:

(A)

← (A) OR (M(DP))

OR (logical OR between accumulator and memory)

POF2 (Power OFf2)

0000001000

–

Grouping:

Other operation

Description: Puts the system in RAM back-up state by

executing the POF2 instruction after ex-

ecuting the EPOF instruction.

Note:

If the EPOF instruction is not executed before

executing this instruction, this instruction is

equivalent to the NOP instruction.

Operation:

Transition to RAM back-up mode

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