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D O C - 0 3 3 4 - 0 1 0 ,
R E V
D
D E C E M B E R
2 ,
2 0 0 5
Figure 2: COM Connector
1
TXD 2
RXD 3
4
GND 5
6
7 RTS
8 CTS
9 NC
Female DB9 connector that interfaces to the MPU serial port
via the U2 RS232 transceiver. It provides simple 2 wire
asynchronous serial communications without flow control.
Flow control is provided at test points on the module.
Pins 1, 4, and 6 are connected together.
User Options
Indicators LED1 and LED2 are connected to the MPU I/O ports by the USER option bank.
When the appropriate USER jumper is installed, the assigned LED is active. Each LED is
active low. A low voltage level driven out on the appropriate MPU port causes the LED to light.
MPU ports PWMA0 and PWMA1 drive LED1 and LED2 respectively.
Two push button switches provide momentary, active low, input to the MPU for user
applications. Switches SW1 and SW2 are connected to the MPU I/O ports by the USER
option bank. SW1 and SW2 provide input to MCUI/O ports TD0 and TD1 respectively. The
table below shows the user jumper settings.
Table 4: User Option Jumper Settings
Jumper
User 1
User 2
User 3
User 4
On
Enable SW1
Enable SW2
Enable LED1
Enable LED2
Off
Disable SW1
Disable SW2
Disable LED1
Disable LED2
MPU Signal
PWMA0
PWMA1
TD0
TD1
Freescale Semiconductor, Inc.
I/O Connectors
JTAG / OnCE
The JTAG/OnCE 14 pin connector is compatible with the Freescale On Chip Emulation
(OnCE) development port. This connector allows the connection of a OnCE style background
debug cable for software development, programming and debugging in real-time.
10
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