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AD1200 Reference
___________________ _
A/D Operating Modes.
The whole of the AD1200 range can be programmed to
perform its A/D conversions using one of four modes. These
modes
select
conversions, choose whether the continuous conversions should
be paced via the built in 600kHz oscillator or via an external
user supplied clock and determine what starts the pacer clock
running.
A/D Control Status Reg Bits 6 & 7, XMODE, in TIMER register=0
MODE
ADCSR
BIT 1
0
0
1
0
2
1
3
1
The mode select determines the source of the A/D
STROBE, this is the signal that forces the A/D converter to
START performing its next conversion.
Whether Interrupts or DMA transfers occur on A/D
conversion Done depends on the setting of the INTERRUPT
ENABLE and DMA ENABLE bits in the ADCSR, the A/D
Control Status Register, register 0.
Page 16
between
single
Figure 1-8. Mode 0 & 1 Bits.
________________________ _
ADCSR
FUNCTION
BIT 0
0
Single A/D Conversion when ADGCR
A/D Gain/Channel Register, is written.
1
Continuous A/D conversions by pacer clock
using on board 600kHz oscillator.
Clock started when ADGCR is written.
0
Continuous A/D conversions by pacer clock
using on board 600kHz oscillator.
Clock started by Ext Trigger -ve edge.
0
Continuous A/D conversions by pacer clock
using on External Clock.
Clock started by Ext Trigger -ve edge.
conversion
or
Introduction
continuous
Chapter 1
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