Manual Number: 00650-004-5
Page 5-10
ADIO1600 Manual
Base + 8 Write:
Write DAC 0 least significant byte.
7
B
6
B
5
B
4
B
3
B
2
B
1
B
0
B
7
A
D
6
A
D
5
A
D
4
A
D
3
A
D
2
A
D
1
A
D
0
A
D
DA0-DA7:
Least-significant eight bits of the DAC 0 output value. DA0 is the least-
significant bit.
Base + 9 Write:
Write DAC 0 most significant byte.
7
B
6
B
5
B
4
B
3
B
2
B
1
B
0
B
x
x
x
x
1
1
A
D
0
1
A
D
9
A
D
8
A
D
DA8-DA11:
The four most-significant bits of the DAC 0 output. DA11 is the most-
significant bit.
Base + A Write:
Write DAC 1 least-significant byte. The format is the same as base +8
Base + B Write:
Write DAC 1 most-significant byte. The format is the same as base +9
Counter/Timer Registers
The type 8254 counter/timer chip used contains three 16-bit counters. Counters 1 and 2 are cas-
caded and driven by a 1 MHz clock for periodic triggering of the A/D. Periods of a few microsec-
onds to in excess of an hour can be programmed. Counter #0 is uncommitted and provides a gated
16-bit binary counter that can be used for event or pulse counting, delayed triggering, or (in con-
junction with other channels) for frequency or period measurement. Counter #0 may be driven by
the internal 1MHz clock or an external clock source.
Base + C Write/Read:
Counter #0 read or write. When writing, this register is used to load a
counter value into the counter. The transfer is either a single or double byte transfer, depending
on the control byte written to the counter control register at Base + 15. If a double byte transfer
is used, then the least-significant byte of the 16 bit value is written first, followed by the most
significant byte. When reading, the current count of the counter is read. The type of transfer is
also set by the control byte.
Additional information about the type 8254 counters is presented in the Programmable Interval
Timer section of this manual. However, for a full description of features of this extremely
versatile IC, refer to the Intel 8254 data sheet. The counter read/write registers are located as
follows:
Base + D Write/Read:
Counter #1 read or write. See description for Base + 12.
Base + E Write/Read:
Counter #2 read or write. See description for Base + 12
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