Freescale Semiconductor M9328MX21ADSE User Manual
Support Information
M9328MX21ADSE User’s Manual, Rev. A
3-20
Freescale Semiconductor
3.4.3
External UART Connector
Connector P3 is connected to Port A of U17, an Exar ST16C255 DUART. This female DB9 connector is
configured for RS-232 Data Communications Equipment (DCE) operation. Figure 3-7 shows the pin
assignments and Table 3-7 provides signal descriptions for the connector.
configured for RS-232 Data Communications Equipment (DCE) operation. Figure 3-7 shows the pin
assignments and Table 3-7 provides signal descriptions for the connector.
Figure 3-7. Connector P3 (EXT UART) DCE Pin Assignments
3.5
Multi-ICE Connector
Connector P20 is the ADS Multi-ICE connector. Figure 3-8 shows pin assignments and Table 3-8 provides
signal descriptions for the connector.
signal descriptions for the connector.
Figure 3-8. Multi-ICE Connector P20 (on the CPU) Pin Assignments
Table 3-7. Connector P3 (EXT UART) DCE Signal Descriptions
Pin(s) Signal
Description
1
CD
CARRIER DETECT — RS-232 output signal, pulled active positive
2
TXD
TRANSMITTED DATA — RS-232 serial data output signal
3
RXD RECEIVED DATA – RS-232 serial data input signal
4
DTR
DATA TERMINAL READY — RS-232 serial data input signal, the logic level signal is
available at TP9
available at TP9
5
GND GROUND
6
DSR DATA SET READY — RS-232 output signal, pulled active positive
7
RTS
READY TO SEND — RS-232 input signal, active positive,
8
CTS
CLEAR TO SEND — RS-232 output signal, active positive,
9
RI
RING INDICATOR — RS-232 output signal, forced inactive negative
P20
VCC
1
• •
2
VCC
TRST_B
3
• •
4
GND
TDI
5
• •
6
GND
TMS
7
• •
8
GND
TCK
9
• •
10
GND
RTCK 11
• •
12
GND
TDO 13
• •
14
GND
RESET_IN_B 15
• •
16
GND
NC 17
• •
18
GND
NC 19
• •
20
GND
1
RX
D
TX
D
RI
CT
S
RT
S
DS
R
P3
2
3
4
5
9
8
7
6
DT
R
G
ND
CD