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Special Registers
EBX-37 Reference Manual
65
A/D and D/A Control/Status Register
This register is used to control A/D and D/A conversion.
ADCONSTAT (Read/Write) CAFh (or C9Fh)
D7
D6
D5
D4
D3
D2
D1
D0
Reserved
Reserved
Reserved
DACLDA0
Reserved
ADCBUSY0
Reserved
ADCONVST0
Table 35: A/D, D/A Control/Status Register Bit Assignments
Bit
Mnemonic
Description
D7-D6
Reserved
These bits are reserved. Only write 0 to these bits and ignore all read values.
D5
Reserved
This bit is reserved. Only write 0 to this bit and ignore read values.
D4
DACLDA0
This is a write-only (pulsed) bit. When a ‘1’ is written it will strobe the LDAC signal
on the LTC2634 D/A Converter. Writing a ‘0’ is ignored.
D3
Reserved
This bit is reserved. Only write 0 to this bit and ignore read values.
D2
ADCBUSY0
This read-only status bit returns the A/D conversion status.
0 – A/D is not busy doing a conversion.
1 – A/D is busy doing a conversion.
D1
Reserved
This bit is reserved. Only write 0 to this bit and ignore read values.
D0
ADCONVST0
This is a write-only (pulsed) bit. When a ‘1’ is written it will start a conversion on
the LTC1857 A/D converter. Writing a ‘0’ is ignored.
System Test Register
This register is used for system test and should not be accessed.
SYSTEST (Read/Write) CAEh (or C9Eh)
D7
D6
D5
D4
D3
D2
D1
D0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Table 36: System Test Register Bit Assignments
Bit
Mnemonic
Description
D7-D0
Reserved
These bits are reserved. Only write 0 to these bits and ignore all read values.