19 External Connections
The MPAP-200 is configured as a Data Terminal Equipment (DTE) device using a
DB-25 male connector. There is no DCE version available.
The control signals the DTE can generate are Request To Send (RTS) and Data Terminal
Ready (DTR). It can receive the signals Carrier Detect (DCD), Clear to Send (CTS), and Data
Set Ready (DSR). All the control signals are controlled through channel A of the SCC, with the
exception of the DSR signal, which is received on the DCDB pin on channel B. (The SCC has
no actual DSR inputs.)
The transmit clock (TCLK, SCC TRxCA pin) can be transmitted on TTCLK or received
on RTCLK, depending on TCKEN. The receive clock (RCLK, SCC RTxC pins) can be received
on RRCLK or can be generated using the TRxCB pin , depending on RCKEN. The receive clock
cannot be transmitted. TCLK and RCLK can also be internally sourced from the channel A baud
rate generator.
Figure 1 shows the DTE clock configuration. On the left are the SCC clock pins and the
clock enable bits from the Communications Register. On the right are the signals at the DB-25
connector.
TRxCA
(TCLK)
RTxCA
(RCLK)
RTxCB
RTCLK
RRCLK
TRxCB
RCKEN
TTCLK
TCKEN
Figure 1 --- MPAP-200 Clock Configuration
54
Содержание MPAP-200
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