Sharp PC-1600

-
PC-1600
Pin
Symbol
ln/Out
Active
Function
No.
level
19-26
DATA1-DATAS
ln/Out -
Bidirectional parallel data bus fixed to the outpur mode.
The input mode is established with a high CDS state and the outpur mode is
established with a low CDS state. The contents of data are in the reverse phase.
27
DSTB
ln/Out
-
Parallel mode data strobe signal.
Data strobe is sent when CDS is "1."
Data strebe is received when CDS is "0."
28
ACK
ln/Out
-
Parallel mode acknowledge signal.
ACK is se nt when CDS is "1."
ACK is received when CDS is "0."
29
FAULT
ln/Out
-
Parallel mode fault signal.
When CDS is "1," the contents of the bit "0" of the command bvte are sent out.
When CDS is "0," the contents of this signal line can be known by the status bit "0."
Mainly used for detection of a fault in the device.
30
BUSY
ln/Out
-
Parallel mode busv signal.
When CDS is "1," a busv signal is sent.
When CDS is "0," a busy signal is received.
31
PRIME
ln/Out
-
Parallel mode input PRIME signal.
When CDS is "1," it serves as a single bit input port.
When CDS is "0," it serves as a single bit outpur line, but it still would be possible to
choose a high level, low level, or one-shot pulse signal.
32
SLCT
ln/Out
-
Parallel mode select signal.
When CDS is "1," the contents of the bit " 1" of the command byte are sent out.
When CDS is "0," the contents of this signal line can be known by the status bit "1."
Mainly used for a device select.
33 RTS
Out
Serial mode request to send signal.
A general purpese I-bit outpur port in the reverse phase. By programming the bit "5"
of the command bvte, it is set to "0." The signal is normally used by the modem
control as arequest to send.
34 DSR In
Serial mode data set ready signal.
A general purpose 1-bit input port in the reverse phase. It is possible to know the state
of the signal by interrogating the status information (bit 7) of the serial interface. This
signal is normally used for tests by the modem for such as a data set ready. With the
PC-1600, this signal is connected with the RX D line.
35 CTS In
Serial mode clear to send signal. Connected to GND.
If the TXEN bit of the command bvte has been set to "1," a high on this line enables
the SMI transmit (serial).
36
DTR
Out - Serial mode da ta terminal ready signal.
A general purpese t-bit input port in the reverse phase. By programming the bit "5" of
the command bvte, it is set to "0." The signal is normally used for the modem control
as a data terminal ready.
37 TXD
Out
-
Serial mode transmit da ta signal.
Serial data output for the serial interface.
38
RXD
In - Serial mode receive data signal.
Serial data input for the serial interface.
39 VCC Power - Power supplv,
supply
40 CDS
In
-
Parallel mode direction selection line. Fixed to GND, it's an input signal to determine
1:hedir-ection of the por-allel trrrer+ece. When '{he si9nal ia et ZI low level, the parallel
interface is operated in the outpur mode. When the signal is at a high level, the parallel
interface is operated in the input mode.
41 XCLK In
-
Fixed to GND.
This line is an input to the internal 4·bit programmable prescaler. Its outpur becomes
the system clock (SYS·CLK) which is used for internal timing generation and baud rate
generation. Norrnallv, 400KHz-10MHz is used as the system clock frequency.
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