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SERIES AVME935X- 1/9450- I/9510-X USER'S MANUAL
VMEbus ISOLATION BOARDS
3.1.10 Conversion Status Reqister
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CHAPTER 3
PROGRAMMING INFORMATION
(read onlv) - 91H
This r e g i s t e r r e f l e c t s t h e s t a t u s o f A/D conversions.
Where :
B i t 7: End o f Conversion Flag (EOCF): This b i t i s s e t t o a "1" when a
conversion sequence i s completed. The b i t i s s e t t o "On when the Data
Register is read.
B i t 6: Conversion S t a r t e d (STRD): Set t o a "1" when t h e A/D s t a r t s t o
d i g i t i z e t h e analog i n p u t signal. A t t h i s point, since the sample and h o l d
c i r c u i t i s i n t h e hold mode, t h e data i n t h e Channel Select and Control
Registers can be changed without a f f e c t i n g t h e conversion data. Reset t o a
"0" when t h e Data Register i s read.
B i t 5: Conversion Requested (CREQ): Set t o a "1" when a conversion
sequence i s requested provided t h a t t h e data from t h e previous conversion has
been read. Reset t o a "0" when the A/D s t a r t s t o d i g i t i z e t h e analog i n p u t
signal. The prime use o f t h i s signal i s f o r diagnostics.
B i t 4: Missed Trigger I n p u t (MTI): This B i t i s s e t t o "1" i f a t r i g g e r
occurs a f t e r a conversion has been s t a r t e d and before t h e d i g i t a l data f o r the
conversion has been read. The s t a t u s o f t h i s b i t can be c r i t i c a l i n assuring
t h a t the A/D data i s v a l i d when there i s a p o s s i b i l i t y o f n o t reading i t
before another t r i g g e r occurs. The b i t i s r e s e t t o "On when t h e Data Register
i s read.
Reset condition:
3.1.11
A l l b i t s s e t t o "0".
S t a r t Conversion Reqister
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( w r i t e onlv) - 93H
The S t a r t Conversion Register i s a w r i t e o n l y r e g i s t e r and i s used t o t r i g g e r
a conversion when software t r i g g e r i n g has been selected w i t h B i t 4 o f t h e
Control Register.
NOTE:
"Xn means t h e b i t value does n o t matter.
Reset condition:
This Register i s n o t a f f e c t e d by RESET.
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