UPD77019 datasheet(23/56 Pages) NEC

23 / 56 page

µPD77018A, 77019

INSTRUCTIONS

3.1

Outline

All

µPD77018A instructions are one-word instructions, consisting of 32 bits. And they are executed in 16.6 ns (min.)

per instruction. There are following 9 instruction types.

(1) Trinomial instructions

: specify the Acc operation. 3 of general registers are specified optionally as the operation object.

(2) Dyadic operation instructions

: specify the Acc, ALU or shifter operation. 2 of general registers are specified optionally as the operation

object. Some instructions can specify a general register and immediate data.

(3) Monadic operation instructions

: specify operations by ALU. 1 general register is specified optionally as the operation object.

(4) Load/store instructions

: transfer 16 bits data from memory to general registers, from general registers to memory and between

general registers.

(5) Inter-register transfer instructions

: transfer data between general register and other registers.

(6) Immediate data set instructions

: set immediate data at general registers or each registers of address operation unit.

(7) Branch instructions

: specify the direction of the program flow.

(8) Hardware loop instructions

: specify times of instruction repeating.

(9) Control Instructions

: specify the control program.

UPD77019 Datasheet(PDF) 23 Page - NEC