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analog-to-digital (A/D) converter: A circuit that translates an analog signal
to a digital signal.
AR: See
auxiliary register
.
AR0–AR7:
Auxiliary registers 0 through 7.
See
auxiliary register
.
ARAU: See
auxiliary register arithmetic unit (ARAU).
ARB: See
auxiliary register pointer buffer (ARB)
.
ARP:
See
auxiliary register pointer (ARP).
ARSR:
Asynchronous serial port receive shift register.
A 16-bit register in the
on-chip asynchronous serial port that receives data from the RX pin one
bit at a time. When full, ARSR transfers its data to the ADTR. See also
ADTR.
ASPCR:
Asynchronous serial port control register
. A 16-bit register used to
control the on-chip asynchronous serial port; contains bits for setting port
modes, enabling or disabling the automatic baud-rate detection logic, se-
lecting the number of stop bits, enabling or disabling interrupts, setting
the default level on the TX pin, configuring pins IO3–IO0, and resetting
the port.
auxiliary register: One of eight 16-bit registers (AR7–AR0) used as point-
ers to addresses in data space. The registers are operated on by the aux-
iliary register arithmetic unit (ARAU) and are selected by the auxiliary
register pointer (ARP).
auxiliary register arithmetic unit (ARAU): A 16-bit arithmetic unit used to
increment, decrement, or compare the contents of the auxiliary registers.
Its primary function is manipulating auxiliary register values for indirect
addressing.
auxiliary register pointer (ARP): A 3-bit field in status register ST0 that
points to the current auxiliary register.
auxiliary register pointer buffer (ARB): A 3-bit field in status register ST1
that holds the previous value of the auxiliary register pointer (ARP).
AVIS: See
address visibility bit (AVIS)
.
AXSR:
Asynchronous serial port transmit shift register.
A 16-bit register in
the asynchronous serial port that receives data from the ADTR and
transfers it one bit at a time to the TX pin. See also
ADTR
;
TX pin.
Glossary