UPD77115 View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD77115

16-BIT FIXED-POINT DIGITAL SIGNAL PROCESSOR

NEC => Renesas Technology 

µPD77115, 77115A

7. INSTRUCTIONS

7.1 Outline of Instructions

An instruction consists of 32 bits. Almost all the instructions, except some such as branch instructions, are

executed with one system clock. The maximum instruction cycle of the µPD77115 is 13.3 ns. The following nine

types of instructions are available:

(1) Trinomial operation instructions

These instructions specify an operation by the MAC. As the operands, three general-purpose registers can be

specified.

(2) Binomial operation instructions

These instructions specify an operation by the MAC, ALU, or BSFT. As the operands, two general-purpose

registers can be specified. An immediate value can be specified for some of these instructions, instead of a

general-purpose register, for one input.

(3) Uninominal operation instructions

These instructions specify an operation by the ALU. As the operands, one general-purpose register can be

specified.

(4) Load/store instructions

These instructions transfer 16-bit values between memory and a general-purpose register. Any general-purpose

register can be specified as the transfer source or destination.

(5) Register-to-register transfer instructions

These instructions transfer data from one general-purpose register to another.

(6) Immediate value setting instructions

These instructions write an immediate value to a general-purpose register and the registers of the address

operation unit.

(7) Branch instructions

These instruction specify branching of program execution.

(8) Hardware loop instructions

These instruction specify repetitive execution of an instruction.

(9) Control instructions

These instructions are used to control the program.

Data Sheet U14867EJ5V0DS

25

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