PCM-MIO-A-1/Software Summary
v1.0
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Page 17
PCB connectors
• TEKA PC232-A-W1A7-M (J6)
• TEKA PC220-A-W1A7-M (J5)
8.
Software Summary
8.1
A/D Converters
The PCM-MIO-A-1 uses two Linear Technology LTC-1859CG 8-channel A/D
converters. Each device is independently software configurable to support
the listed input modes and ranges. The devices use a full-duplex serial
interface which transmits and receives data simultaneously. An 8-bit
command is shifted into the ADC interface to configure it for the next
conversion. At the same time, the data from the previous conversion is
shifted out of device. Consequently, the conversion result is delayed by
one conversion from the command word.
8.1.1 A/D1 - Starting at BASE +0
The COMMAND register, RESOURCE register, and RESOURCE ENABLE
registers are used to configure the A/D device operation. The specific
options of each register are detailed here.
Notes:
(1) Accessed when REGISTER SELECT (BASE +3 bit 3) = 00
(2) Accessed when REGISTER SELECT (BASE +3 bit 3) = 01
(3) Accessed when REGISTER SELECT (BASE +7, bit 3) = 1X
(4) 0=Disabled, 1=Enabled
Register Address
(Base+)
Read/
Write
7
6
5
4
3
2
1
0
DATA_LO
0
R
LOW ORDER DATA BYTE
DATA-BIT 7
DATA-BIT 6
DATA-BIT 5
DATA-BIT 4
DATA-BIT 3
DATA-BIT 2
DATA-BIT 1
DATA-BIT 0
DATA_HI
1
R
HIGH ORDER DATA BYTE
DATA-BIT 15 DATA-BIT 14 DATA-BIT 13 DATA-BIT 12 DATA-BIT 11 DATA-BIT 10 DATA-BIT 9 DATA-BIT 8
COMMAND
(1)
2
R/W
COMMAND
CMD-BIT 7
CMD-BIT 6
CMD-BIT 5
CMD-BIT 4
CMD-BIT 3
CMD-BIT 2
CMD-BIT 1
CMD-BIT 0
RESOURCE
(2)
2
R/W
DON’T CARE
INTERRUPT ROUTING ASSIGNMENT
IRQ[15-3] 0, 1, 2, 8, AND 13 NOT AVAILABLE
X
X
X
X
BIT 3
BIT 2
BIT 1
BIT 0
DIO
RESOURCE
(3)
2
R/W
X
X
X
X
BIT 3
BIT 2
BIT 1
BIT 0
RESOURCE
ENABLE
3
W
X
X
X
REGISTER SELECT
X
X
INTERRUPT
ENABLE (3)
BIT 1
BIT 0
X
X
STATUS
3
R
DATA READY
X
X
INTERRUPT
REQUEST
PENDING (3)
REGISTER
SELECT
STATUS
X
X
INTERRUPT
ENABLE BIT
STATUS (3)
