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Register Map
the A/D converter.
Figure 3-4. AD1200 Extended Mode Bits.
___________________________________ _
AD1200 Card Only TIMER Extended Mode Bits
BIT 7
BIT 6
0
0
0
1
1
0
1
1
Figure 3-5. AD1210-21 Extended Mode Bit.
_____________________________________
AD1210-AD1221 TIMER Extended Mode Bits
BIT 7
BIT 6
0
Always= 0
1
Always= 0
___________________________
Initialising The A/D Converter.
The A/D converter should be initialised by performing the
following steps before changing the mode set in the ADCSR.
The Real World driver software supplied with the card performs
this automatically on mode changes, or when the 'Init' routine is
called.
i)
Write 00hex to the ADCSR, ie disable pacer clock
conversions, stop pacer clock running, disable interrupts,
disable DMA.
ii)
Wait at least 100uS, ie allow any A/D conversion in
progress to finish.
iii)
Read the high byte of the A/D data, ADCHI, ie clear the
A/D Done bit.
iv)
Write 10hex to the ADCSR, ie clear any A/D Error bit.
Chapter 3
Continuous Conversion Performed On
A/D Converter
DAC0
DAC1
DIGITAL I/O PORT
AD Clock
600kHz On Board Pacer Clock
8254 Timer Counter
AD1200 Reference
Compatible Mode
Page 57
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