Power Up Conditions; The A/D Control Status Register; Bit 7 A/D Done, Read Only; Figure 3-2. A/D Control Status Register - Brainboxes AD-593 User Manual

Register Map
___________________

Power Up Conditions.

On power up all registers are set to zero.
____________________________ _

The A/D Control Status Register.

The most important register in the AD1200 series of cards
is the control status register. It is the primary control register for
the AD Converter, it holds the A/D Busy and A/D Done bits
which indicate whether an A/D conversion is in progress or
finished, its A/D Error and Clear Error bits are used to detect
and service A/D overrun or triggering mistakes. The DMA and
Interrupt enable bits are used to decide whether the A/D Done
bit causes a DMA read or system interrupt. Finally its Mode bits
determine whether single shot or continuous A/D conversions are
performed and what initiates the repetitive conversions and at
what rate they occur.
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Figure 3-2. A/D Control Status Register.

ADCSR A/D Control Status Register.
BIT 7
0218 A/D
Hex DONE
Read

Bit 7 A/D Done, Read Only.

________________________
This bit is indicates that the A/D converter has a reading
ready.
Set By: The A/D converter when it has finished converting an
analogue input.
If Bit 3, DMA Enable, of the ADCSR is also set
then a DMA cycle will be generated when this bit is
set by the ADC.
If Bit 2, Interrupt Enable, of the ADCSR is also set,
but not Bit 3, then an interrupt will be generated
when this bit is set by the ADC.
Chapter 3
BIT 6 BIT 5
A/D A/D
ERROR BUSY
Read Read
BIT 4 BIT 3
CLEAR DMA
ERROR ENABLE ENABLE BIT 1
Write R/W
AD1200 Reference
BIT 2 BIT 1
INT MODE
R/W R/W
Page 53
BIT 0
MODE
BIT 0
R/W