rtd DM6210, User Manual

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4-3
Defining the I/O Map
The I/O map for the DM6210 is shown in Table 4-1 below. As shown, the module occupies 16 consecu-
tive I/O port locations.
The base address (designated as BA) can be selected using DIP switch S1, located on the edge of the
module, as described in Chapter 1, Module Settings . This switch can be accessed without removing the
module from the stack. The following sections describe the register contents of each address used in the I/O
map.
Table 4-1 DM6210 I/O Map
Register Description Read Function Write Function
Address *
(Decimal)
Read Data/
Start Conversion
Read A/D converted data Start A/D conversion BA + 0
Reserved Reserved Reserved BA + 1
Board ID LSB Read Board ID LSB Reserved BA + 2
Board ID MSB Read Board ID MSB Reserved BA + 3
Channel Register Read current channel Write current channel BA + 4
IRQ Register Read IRQ settings Write IRQ settings BA + 5
Read Status/Clear IRQ Read status word Clear interrupt line BA + 6
Reserved Reserved Reserved BA + 7
8254 Timer/Counter 0 Read count value Load count register BA + 8
8254 Timer/Counter 1 Read count value Load count register BA + 9
8254 Timer/Counter 2 Read count value Load count register BA + 10
8254 Timer/Counter
Control Word
Reserved Program counter mode BA + 11
Digital I/O Port 0
Read Port 0 digital input
lines Program Port 0 digital output
lines
BA + 12
Digital I/O Port 1
Read Port 1 digital input
lines Program Port 1 digital output
lines
BA + 13
Digital I/O Strobe Select Read strobe select register
Program strobe select
register
BA + 14
Digital I/O Control Read control register Program control register BA + 15
* BA = Base Address