參數(shù)資料
型號(hào)： MX839
廠商： Electronic Theatre Controls, Inc.
英文描述： Digitally Controlled Analog I/O Processor
中文描述： 數(shù)字控制的模擬I / O處理器
文件頁(yè)數(shù)： 7/20頁(yè)
文件大?。?/td> 165K
代理商： MX839
Digitally Controlled Analog I/O Processor
7
MX839 PRELIMINARY INFORMATION
1998 MX
x
COM Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tele: 800 638-5577 336 744-5050 Fax: 336 744-5054
Doc. # 20480164.002
All trademarks and service marks are held by their respective companies.
After enabling conversions the user must allow time for all enabled channels to be digitized before reading the results via
the ‘C-BUS’. The minimum required time to wait is:
A/D_CLK
CONV_MAX
T
f
Inputs'
Enabled
of
Number
'
2
+
10
(
=
[Seconds]
Upon disabling conversions the data for the most recent conversion completed for each channel will be available via the
‘C-BUS’ commands ‘READ A/D DATA x’ (addresses $DC, $DD, $DE, $DF) for input channels 1 through 4 respectively.
Do not forget to re-enable conversions by setting A/D control register bit 5, the READ bit, back high after reading the
desired A/D results. Note that the Magnitude Comparators (see section 4.4) can be configured to monitor the A/D channel
data in order to minimize the software burden of continuously reading the A/D channel data. It is not recommended to
issue ‘READ A/D DATA x’ commands without first setting A/D control register bit 5, the READ bit, low.
An Example C-BUS transaction to do a conversion and read of A/D Channel 1:
HEX
ADDRESS/
COMMAND
WRITE
DATA
BYTE 1
READ
DATA
BYTE 1
READ
DATA
BYTE 2
COMMENT
$01
$D0
N/A
$03
N/A
N/A
N/A
N/A
Reset Device
Set f
A/D_CLK
DIVIDER = 4
Enable conversion on A/D Channel 1
Disable conversions after waiting T
CONV_MAX
Read A/D Channel 1 Data
Re-enable conversion on A/D Channel 1
$D7
$D7
$70
$50
N/A
N/A
N/A
N/A
$DC
$D7
N/A
$70
xxxxxxxx
N/A
000000xx
N/A
4.4 Magnitude Comparators and Interrupt Request
High and low digital comparator reference levels are provided for the four digital magnitude comparators via the 'C-BUS'
interface. The digital input to the comparators is provided by the most significant 8 data bits of each A/D channel
When the sampled data falls outside the high or low digital comparator reference levels the status register is updated and
the IRQ pin is pulled low. When a reference level is set to '0', its IRQ is disabled.
4.5 Software Description
4.5.1
Instructions and Data are transferred via the 'C-BUS' in accordance with the timing information provided in Figure 5.
Instruction and data transactions to and from the FX839 consist of an Address/Command byte followed by either:
(i) a control or DAC data write (1 or 2 bytes) or,
(ii) a status or A/D data read (1 or 2 bytes)
Address/Commands
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