Advertisement
A serial interface is an asynchronous serial system.
15) and DSR (Pin 100) of the CPU with a 47k
1) Circuit
2) Signal names and their functions
Signal Name
TXD
RXD
DSR
DTR
Pin No.
Input/Output
13
Output
15
Input
100
Input
12
Output
When the serial interface is not used, pull up RXD (Pin
resistor.
Transmits the status.
If data reception is disabled when XON/XOFF is
selected, XOFF(13H) will be transmitted, and if data
reception is enabled, XON(11H) will be transmitted.
Received data signal.
error occurs, the relevant data will be printed "?".
With DTR/DSR selected, if this signal is "LOW," the
data will be transmitted from the CPU.
the data will be transmitted after the signal is turned
to "LOW."
Transmit the data when this signal is "LOW."
written when it is "HIGH," an overrun error will
result, ignoring the data.
23
CBM-202PC-04 User's Manual
Function
If a framing error or parity
If "HIGH,"
If
CITIZEN
Advertisement
