DEMO9S08SG8 Freescale Semiconductor, DEMO9S08SG8 Datasheet - Page 12

• Manufacturer Part Number: DEMO9S08SG8
• Description: BOARD DEMO FOR MC9S08SG FAM
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of DEMO9S08SG8

• Contents: Board, Cable, CD
• Silicon Manufacturer: Freescale
• Core Architecture: HCS08
• Core Sub-architecture: HCS08
• Silicon Core Number: MC9S08
• Silicon Family Name: S08SG
• Rohs Compliant: Yes
• For Use With/related Products: MC9S08SG4, MC9S08SG8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

U S E R
RS-232
An RS-232 translator provides RS-232 to TTL/CMOS logic level translation on the COM con-
nector. The COM connector is a 9-pin Dsub, right-angle connector. A ferrite bead on shield
ground provides conducted immunity protection. Communication signals TXD1 and RXD1 are
routed from the transceiver to the MCU. Hardware flow control signals RTS and CTS are
available on the logic side of the transceiver. These signals are routed to vias located near the
transceiver. RTS has been biased properly to support 2-wire RS-232 communications.
Table 4: COM Connections
COM Connector
A standard 9-pin Dsub connector provides external connections for the SCI0 port. The Dsub
shell is connected to board ground through a ferrite bead. The ferrite bead provides noise
isolation on the RS-232 connection. The figure below details the DB9 connector.
Figure 4: COM Connector
COM_EN
The RS-232 PHY is connected to the MCU through the COM_EN option header. Installing
shunts in position TX and RX connects the transceiver. Removing the shunts isolates the
transceiver from the MCU.
Table 5: COM_EN Option
G U I D E
MCU Port
PTB1/PIB1/SLTXD/TXD/ADP5
PTB0/PIB0/SLRXD/RXD/ADP4
GND
RXD
TXD
4, 6
1, 6
COM_EN
1
2
1
2
3
4
5
6
7
8
9
TX
RX
1, 4
RTS
CTS
NC
Enabled
Enabled
Female DB9 connector that interfaces to the MCU internal SCI0 serial
port via the RS232 transceiver. Flow control is provided at test points on
the board.
Pins 1, 4, and 6 are connected together.
ON
Disabled
Disabled
COM Signal
TXD
RXD
OFF
12
I/O PORT
CONNECTOR
J1-5
J1-7