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Appendix C
PC Statements and Refresh Timing
119
PC READ @...
Data is read from the first I/O refresh after execution of PC READ @..., irrespective of the status of the Write
flag.
I/O refresh
Instruction execution
I/O refresh
I/O refresh
ASCII Unit
C200H CPU
Transfer words
First word transfer
Instruction execution
Instruction execution
READ
PC READ @...statement
ASCII busy
(word n+3 bit 00)
PC WRITE
In four-word mode, when the PC’s READ flag is set during I/O refresh, the PC WRITE statement obtains the
base word address and the number of words to be transferred. With the next I/O refresh, data is transferred.
I/O Refresh
ASCII Unit
C200H CPU
Instruction Execution
I/O Refresh
I/O Refresh
I/O Refresh
READ Flag (word n bit 02)
ASCII Busy (word n+3 bit 00)
Instruction Execution
Instruction Execution
PC WRITE statement
Transfer Words
First Transfer Word
WRITE
Summary of Contents for SYSMAC C200H-ASC02
Page 1: ...Cat No W165 E1 04 ASCII Unit SYSMAC C200H ASC02 ...
Page 2: ...C200H ASC02 ASCII Unit Operation Manual Revised September 2002 ...
Page 3: ...iv ...
Page 5: ...vi ...
Page 7: ...TABLE OF CONTENTS viii Glossary 159 Index 163 Revision History 165 ...
Page 122: ...Appendix B Specifications 115 130 35 100 5 ...
Page 168: ...Cat No W165 E1 04 C200H ASC02 ASCII Unit OPERATION MANUAL ...