PCM-MIO-A-1/Software Summary
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Page 18
8.1.2 A/D2 - Starting at BASE +4
The interface for the second A/D device is almost identical to the first
device. Notice in this table that the REGISTER SELECT function within the
RESOURCE ENABLE register is only a single bit. In both software examples
shown below, action 1 (one) should be replaced with:
1. Write
xxxx1xxx
to bit 3 of BASE +7 (select access to Resources).
Bit 4 is a don’t care in this case, so it is possible to use identical code for
both devices just noting the different base address.
Notes:
(1) Accessed when REGISTER SELECT (BASE +7 bit 3) = 0
(2) Accessed when REGISTER SELECT (BASE +7 bit 3) = 1
(3) 0=Disabled, 1=Enabled
Register Address
(Base+)
Read/
Write
7
6
5
4
3
2
1
0
DATA_LO
4
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
5
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)
6
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)
6
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
7
W
X
X
X
X
REGISTER
SELECT
X
X
INTERRUPT
ENABLE (3)
X
X
STATUS
7
R
DATA READY
X
X
INTERRUPT
REQUEST
PENDING (3)
REGISTER
SELECT
STATUS
X
X
INTERRUPT
ENABLE BIT
STATUS (3)
