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
10
Figure 2: COM Connector
1
6
TXD
2
7
RTS
RXD
3
8
CTS
4
9
NC
GND
5
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
On
Off
MPU Signal
User 1
Enable SW1
Disable SW1
PWMA0
User 2
Enable SW2
Disable SW2
PWMA1
User 3
Enable LED1
Disable LED1
TD0
User 4
Enable LED2
Disable LED2
TD1
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.
Freescale Semiconductor, Inc.
