IBM AR-B3001, Руководство пользователя, Страница: 17 / 41

ACROSSER TECHNOLOGY
17
Trig
Trigger A/D. Write a high(1) to this bit will start the
A/D conversion. This bit can not be high longer than
1/30.5 second. A good practice is to send a high
and then send a low immediately.
DH
Data high enable. This bit enables the A/D converter
output the high byte of converted data. DH = 1
enables the A/D converter to output the high byte
data. DH = 0 disables the A/D converter to output
the high byte data.
DL
Data low enable. This bit enables the A/D converter
output the low byte of converted data. DL = 1
enables the A/D converter to output the low byte
data. DL = 0 disables the A/D converter to output
the low byte data. Note that DH and DL can not be
high at the same time.
CH0 to CH3
Next channel to be converted. These three bits
control the multiplexer to select an input from the
16(differential) or 8(single-ended) channels of
analog inputs to be converted. The CH3 is the MSB
of channel number and CH0 is the LSB of Channel
number. For example, to select channel 9 as the
input channel, 1001 has to be written to the CH3,
CH2, CH1 and CH0.
X Don't care.