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Freescale Semiconductor, Inc.
The RS-232 serial port connector is a 9 pin, male, D-type connector as shown in FIGURE 2-6.
4.11.4.1
RS-232 Port Signal Description
In the list below, the directions 'I', 'O', and 'I/O' are relative to the M68360QUADS-040 board. (I.E. 'I' means
input to the M68360QUADS-040)
•
CD ( O ) - Data Carrier Detect. This line is always asserted by the ADS.
•
TX ( O ) - Transmit Data.
•
RX ( I ) - Receive Data.
•
DTR ( I ) - Data Terminal Ready. This signal is used by the software in the ADS to detect if a
terminal is connected to the ADS board.
•
DSR ( O ) - Data Set Ready. This line is always asserted by the ADS.
•
RTS ( I ) - Request To Send. This line is not connected in the ADS.
•
CTS ( O ) - Clear To Send. This line is always asserted by the ADS.
4.11.5
M68360QUADS-040 Status Register
The status register is a 16 bit wide READ ONLY register used to hold board status, level 7 interrupt source
identification and an input register for ADI interface signals.
15
14
13
12
DTR*
H_NMI* INACK* ADSSEL HSREQ* HSACK* HSTEN HSVCC* SIMM4
4.11.5.1
Status Register Bits Description
•
DTR* - When active '0', indicates that a terminal is connected to the serial port.
•
H_NMI* - When active '0', indicates that the last level 7 interrupt (NMI) was generated from the
host via the ADI port.
•
INACK - When active '0', indicates that a Host Interrupt Acknowledge cycle is in progress.
•
ADSSEL - When active '1', indicates that the board is selected by the ADI port.
•
HSREQ* - When active '0', indicates that the host request to write a data byte to the board via the
ADI port.
•
HSACK* - When active '0', indicates that the host has successfully read a byte of data written to
it by the board via the ADI port.
•
HSTEN - When active '1', indicates that the board is connected to an ADI port.
•
HSVCC* - When active '0', indicates that the host computer is alive (not turned off).
M68360QUADS-040 Hardware User's Manual
FIGURE 4-3 RS-232 Serial Port Connector
DCD
1
TX
2
RX
3
DTR
4
5
GND
FIGURE 4-4 Status Register
11
10
9
8
For More Information On This Product,
Go to: www.freescale.com
FUNCTIONAL DESCRIPTION
6
DSR
7
RTS
8
CTS
9
N.C.
7
6
5
4
3
SIMM3
SIMM2
SIMM1
BKINT*
2
1
0
OPT0*
OPT1*
OPT2*
35
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