PD780C datasheet(11/24 Pages) NEC

11 / 24 page

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Instruction Set

The instruction set of the IlPD780 consists of 158

types of instructions divided into 16 categories as

follows:

8-bit load operations

memory block searches

16-bit arithmetic operations

rotate and shift operations

jump operations

restart operations

miscellaneous operations

16-bit load operations

memory block transfers

8-bit arithmetic and

logic operations

bit set, reset, and test

operations

1/0 operations

call operations

return operations

general-purpose

accumulator and flag

operations

This comprehensive instruction set is made more

powerful by the array of addressing modes im

plemented by the architecture, as follows:

bit addressing

immediate addressing

extended addressing

implied addressing

relative addressing

immediate-extended

addressing

indexed addressing

modified page zero

addressing

J.(PD780

Instruction Set Symbol Definitions

Symbol

Description

•

Flag not affected

Flag set

Flag

Flag affected according to result of operation

Overflow set

Parity set

IFF

nterrupt flip-flop set

CarrylLink

Zero

P/V

ParityIOverflow

Sign

Add/Subtract

Half Carry

4-13

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