DB839 Datasheet, PDF (9/20 Pages) CML Microcircuits – Two Variable Attenuators

Digitally Controlled Analog I/O Processor
9
MX839 PRELIMINARY INFORMATION
4.6 Read Only Registers (8-Bit and 16-Bit)
HEX
ADDRESS/
COMMAND
$D1
$DC
$DD
$DE
$DF
REGISTER BIT 7
NAME
(D7)
IRQ
FLAGS
A/D DATA1
(1)
(2)
A/D DATA2
(1)
(2)
A/D DATA3
(1)
(2)
A/D DATA4
(1)
(2)
HIRQF
4
BIT 7
0
BIT 7
0
BIT 7
0
BIT 7
0
BIT 6
(D6)
LIRQF
4
BIT 6
0
BIT 6
0
BIT 6
0
BIT 6
0
BIT 5
(D5)
HIRQF
3
BIT 5
0
BIT 5
0
BIT 5
0
BIT 5
0
BIT 4
(D4)
LIRQF
3
BIT 4
0
BIT 4
0
BIT 4
0
BIT 4
0
BIT 3
(D3)
HIRQF
2
BIT 3
0
BIT 3
0
BIT 3
0
BIT 3
0
BIT 2
(D2)
LIRQF
2
BIT 2
0
BIT 2
0
BIT 2
0
BIT 2
0
BIT 1
(D1)
HIRQF
1
BIT 1
BIT 9
BIT 1
BIT 9
BIT 1
BIT 9
BIT 1
BIT 9
BIT 0
(D0)
LIRQF
1
BIT 0
BIT 8
BIT 0
BIT 8
BIT 0
BIT 8
BIT 0
BIT 8
Table 3: Read Only Registers (8-Bit and 16-Bit)
4.7 Write Only Register Description
4.7.1 RESET Register (Hex Address $01)
The reset command has no data attached to it. It sets the device registers into the specific states listed below:
REGISTER NAME
CLOCK CONTROL
DAC CONTROL
DAC1 DATA¹
DAC2 DATA¹
DAC3 DATA¹
A/D CONTROL
VARIABLE ATTENUATOR
MAG COMP ONE LEVELS
MAG COMP TWO LEVELS
MAG COMP THREE LEVELS
MAG COMP FOUR LEVELS
BIT 7
(D7)
0
0
0
BIT 6
(D6)
0
0
0
BIT 5
(D5)
0
0
0
BIT 4
(D4)
0
0
0
BIT 3
(D3)
0
0
0
BIT 2
(D2)
0
0
0
BIT 1
(D1)
0
0
0
BIT 0
(D0)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
(1)
0
0
0
0
0
0
0
0
(2)
0
0
0
0
0
0
0
0
(1)
0
0
0
0
0
0
0
0
(2)
0
0
0
0
0
0
0
0
(1)
0
0
0
0
0
0
0
0
(2)
0
0
0
0
0
0
0
0
(1)
0
0
0
0
0
0
0
0
(2)
0
0
0
0
0
0
0
0
(1)
0
0
0
0
0
0
0
0
(2)
0
0
0
0
0
0
0
0
Table 4: RESET Register (Hex Address $01)
Note
1. Default resolution is defined as 8-Bits.
© 1998 MXxCOM Inc.
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