Toshiba AS311 Appendix, Specification of the Read instruction, Function, Operand, Program example

Appendix

A.1 Specification of the READ instruction

FUN 237 Special module data read (READ)

Reads designated range of data from the special module.

Input	Execution output
[ A READ B →	C ]

Function

•This instruction reads data from the buffer memory of the special module that is designated by operand A, and stores them in T3’s registers starting with operand C.

• The transfer source address (buffer memory

Input

Action

Output

ERF

address) is designated by operand B.

OFF

No execution

OFF

• The transfer size (number of words) is

ON

Normal execution

ON

designated by operand B+1.

Error (see Note 2)

ON

ON

Operand

Index

Constant

Device

Register

Opr

Name

X

Y

S

L

R

Z

T.

C.

I

O

XW

YW

SW

LW

RW

W

T

C

D

F

IW

O

I

J

K

W

A

Special

√

√

√

√

module

B

Transfer

√

√

√

√

√

√

√

√

√

√

parameter

C

Top register

√

√

√

√

√

√

√

√

√

√

of destination

Program example

R0000

[ XW000 READ RW010 →

D0100 ]

•When R0000 is ON, the buffer memory data of the size indicated by RW011, starting with the address indicated by RW010 of the special module allocated to XW000, are read and stored in D0100 and after.

•The maximum number of words to be read is 256 words.

XW000 special module	T3
	RW010
Buffer memory	RW011

20

16

201234

355678

READ	D0100	1234
16 words	D0115
		5678

60 ASCII Interface Module (AS311)