DEMO908QC16 Freescale Semiconductor, DEMO908QC16 Datasheet - Page 14

• Manufacturer Part Number: DEMO908QC16
• Description: BOARD DEMO FOR MC908QC16
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of DEMO908QC16

• Contents: Board, Cable, CD
• Processor To Be Evaluated: MC908QC16
• Data Bus Width: 8 bit
• Interface Type: RS-232, USB
• Silicon Manufacturer: Freescale
• Core Architecture: HC08
• Core Sub-architecture: HC08
• Silicon Core Number: MC68HC908
• Silicon Family Name: HC08Q
• Kit Contents: Board
• Rohs Compliant: No
• For Use With/related Products: MC908QC16
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

D E M O 9 0 8 Q C 1 6
Figure 6: LIN Connector
RS-232
An RS-232 transceiver provides RS-232 signal level to TTL/CMOS logic level translation on
the COM connector. The COM connector is a 9-pin Dsub, right-angle connector. A ferrite
bead on shield ground provides conducted immunity protection. Communication signals TXD
and RXD are routed from the transceiver to the MCU. These signals are also available at con-
nector J1. Hardware flow control signals RTS and CTS are available on the logic side of U3.
These signals are routed to vias located near the transceiver (U3). RTS has been biased
properly to support handshaking if needed.
Communications signals TXD and RXD also connect to general purpose Port B signals. The
RS-232 translator should be disconnected at the COM_SEL option header if the general-
purpose I/O signals are used.
Figure 7: COM Connections
COM_SEL
The communications mode is determined by the COM_SEL jumper. This 3-pin jumper allows
the user to select between RS-232 communications and LIN communications.
Figure 8: COM_SEL Option Header
NOTE: Board must be powered from the PWR connector with V
MCU Port
PTB5/TXD
PTB4/RXD
COM_SEL
COM_SEL
5
6
5
6
LIN I/O
GND
3
4
3
4
1
2
1
2
4
2
Select LIN communications
Select COM communications
3
1
V
GND
SUP
COM Signal
TXD OUT
RXD IN
REF: Mating Connector, Molex P/N,
14
I/O PORT
CONNECTOR
J1-5
J1-7
39-01-2040, Housing
39-00-0039, Socket
IN
+7V and 18V.
J U N E
2 0 ,
2 0 0 5