Calculator User Manual

F-24
transmit mode (TXM) bit: Bit 3 of the synchronous serial port control regis-
ter (SSPCR); determines whether the source signal for frame synchro-
nization is external or internal.
transmit pin (asynchronous serial port): See
TX pin .
transmit pin (synchronous serial port): See
DX pin .
transmit/receive interrupt (TXRXINT): The CPU interrupt used to respond
to a delta interrupt, receive interrupt, or transmit interrupt from the
asynchronous serial port. All three of these interrupt types request
TXRXINT and use the single TXRXINT interrupt vector. See also
delta
interrupt
; receive interrupt ; transmit interrupt .
transmit register (asynchronous serial port): See
ADTR .
transmit register (synchronous serial port): See
SDTR .
transmit reset (XRST) bit: Bit 5 of the synchronous serial port control regis-
ter (SSPCR); resets the transmitter portion of the synchronous serial
port.
transmit shift register (asynchronous serial port): Also called AXSR, this
register shifts data serially out of the asynchronous serial port through
the TX pin. See also
ARSR .
transmit shift register (synchronous serial port): Also called XSR, this
register shifts data serially out of the synchronous serial port through the
DX pin. See also
RSR .
TRB: See
timer reload bit (TRB).
TREG: See temporary register (TREG).
TSS bit: See timer stop status bit (TSS).
TTL: Transistor-to-transistor logic .
TX pin:
Asynchronous transmit pin . The pin on which data is transmitted
serially from the asynchronous serial port; accepts a character one bit at
a time from the transmit shift register (AXSR).
TXM:
Transmit mode bit . Bit 3 of the synchronous serial port control register
(SSPCR); determines whether the source signal for frame synchroniza-
tion is external or internal.
TXRXINT: See
transmit/receive interrupt (TXRXINT) .
U
UART: Universal asynchronous receiver and transmitter. Used as another
name for the asynchronous serial port.
Glossary