User's Manual

1323x-Modular Reference Board
1323x Development Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor 3-11
3.3.2 IO Connectors J2 and J3
The two IO connectors J2 and J3 are standard 100 mil pin headers mounted on the back (non-component
side) of the 1323x-MRB. The primary header J2 is 20-pin and the secondary header J3 is 18-pin, and they
are mounted physically in such a manner as to prevent reverse insertion of the 1323x-MRB into a
motherboard receptacle (see Figure 3-2). When the 1323x-RCM or 1323x-REM or custom motherboard
is plugged into these connectors, they allow access to MC1323x MCU GPIO.
• V_BRD is the connector supply voltage.
— Depending on power supply configuration, this voltage may supply the 1323x-MRB from the
motherboard or the 1323x-MRB may supply this voltage to the motherboard. See
Section 3.3.1, “Power Management”.
— Peripherals IO to the MC1323x and the MC1323x supply should use this same voltage
NOTE
The 1323x-RCM and 1323x-REM and 1323x-MRB are supplied configured
for the motherboard to supply main power.
• Some of the GPIO are shared with onboard devices. Check for the 1323x-MRB schematic and
Table 3-4 and Table 3-5 for any conflict.
• BDM port signal PTA7/BKGD is NOT connected to the IO headers to prevent possible interference
with the debug port.
Table 3-4. 20 Pin Connector
Header Pin
Number
MC1323x Pin Name Description
1 V_BRD VDD supply to module
2 PTC5/SS SPI Bus Slave Select (SS) - shared with serial FLASH
3 GND Module ground
4 PTC7/MOSI SPI Bus MOSI signal - shared with serial FLASH
5 PTD5/RXD UART RXD input to MCU
6 PTC6/MISO SPI Bus MISO signal - shared with serial FLASH
7 PTD6/TXD UART TXD Output from MCU
8 PTC4/SPICLK SPI Clock (SPISCK) - shared with serial FLASH
9 PTD0/TPM0 GPIO / Timer IO
10 RESET Reset
11 PTA5/SDA I2C Bus data signal (SDA)
12 PTB7/KBI1P7 UART flow control RTS input into MCU (implemented in Freescale software)
13 PTA6/SCL I2C Bus clock signal (SCL)
14 PTD2/TPM2 UART flow control CTS output from MCU (implemented in Freescale software)
15 GND Module ground
16 PTD7/XTAL_32MOUT Port D Bit 7