M68EVB912C32 Freescale Semiconductor, M68EVB912C32 Datasheet - Page 13

• Manufacturer Part Number: M68EVB912C32
• Description: BOARD EVAL FOR MC9S12C32
• Manufacturer: Freescale Semiconductor

Specifications of M68EVB912C32

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

M 6 8 E V B 9 1 2 C 3 2
RTS_EN
The RTS-EN option installed will connect HCS12 I/O port PJ6 (output mode) to the transceiver
as the RTS flow control output signal. User application should configure PJ6 as an output and
apply a logic low to enable the reception of data from the distant end (PC host normally). A
logic high on PJ6 will indicate to the distant end that data should not be sent. User should not
apply PJ6 on the MCU_PORT connector if the RTS_EN option is installed.
CTS_EN
The CTS-EN option installed will connect HCS12 I/O port PJ7 (input mode) to the transceiver
as the CTS flow control input signal. User application should configure PJ7 as an input and
test for a logic low input before transmitting serial data to the distant end (PC host normally). A
logic high input on PJ7 will indicate that the distant end is not ready to receive data and no
data should be transmitted.
connector if the CTS operation is applied or to configure PJ7 as an output with the CTS_EN
option installed.
CAN Port
The CAN PORT provides a 1M baud CAN network transceiver (U12) with CAN_TXEN and
CAN_RXEN options to connect the 9S12C32 CAN signals to the transceiver. Termination and
bias component locations RC11, RC12, and RC13 are also provided on the CAN_PORT. The
CAN_PORT is a 4 position .1 inch space header pin connector with .025sq. pins. See the
MC9S12C32 User Manual for information on operating the device CAN peripheral.
CAN_PORT
CAN_TXEN and CAN_RXEN Options
The CAN_TXEN and CAN_RXEN options connect the HCS12 ports PM1/TXCAN and
PM0/RXCAN respectfully to the CAN transceiver (U12).
jumpers to apply the PM0 and PM1 I/O ports on the MCU_PORT for other applications.
RS Test Pad and Cut Option 1
CAN Transceiver U12 is enabled at all times by the default connection to ground provided by
Cut Option 1. The user may cut the Cut Option 1 to isolate the ground connection from the
transceiver and apply an HCS12 I/O port output to the RS Test pad to control the CAN
transceiver. Cut Option 1 is located on the bottom of the EVB board under the CAN_PORT.
Operation of the RS Test Pad with a HCS12 port output would be logic low to enable the
transceiver and logic high to disable the transceiver.
1 = GND
2 = CAN-HI signal
3 = CAN-LO signal
4 = +5V
Freescale Semiconductor, Inc.
For More Information On This Product,
User should use caution not to apply PJ7 on the MCU_PORT
Go to: www.freescale.com
13
User should open these option
0 5 / 1 5 / 0 3