DEMO908QC16 Freescale Semiconductor, DEMO908QC16 Datasheet - Page 15

• 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
COM Connector
A standard 9-pin Dsub connector provides external connections for the ESCI port. The Dsub
shell is connected to board ground through a ferrite bead. The ferrite bead provides noise
isolation on the RS-232 connection.
Figure 9: COM Connector
USER OPTIONS
The DEMO908QC16 includes various user input and output devices to aid application devel-
opment. User I/O devices include 2 momentary pushbutton switches, 4 green LEDs, 1 poten-
tiometer, and 1 photocell. Each device may be enabled or disabled individually by the USER
option header. The USER _EN header is labeled to easily identify which jumper affects each
user device.
Pushbutton Switches
Two push button switches provide momentary active-low input for user applications. Switches
SW1 and SW2 are enabled to the HC08 I/O ports by the USER-1 and USER-2 enable jump-
ers. SW1 and SW2 provide input to HC08 I/O ports PTA4 and PTA5 respectively. Table 5
below shows the user jumper settings and user signal connections.
LED Indicators
Four LED indicators provide active-high visual output for user applications. Indicators LED1
through LED4 are enabled from HC08 I/O ports by the USER-3 through USER-6 enable jump-
ers. MCU ports PTB6, PTB7, PTD6, and PTD7 drive LED1, LED2, LED3, and LED4 respec-
tively. Table 5 below shows the user jumper settings and user signal connections.
GND
RXD
TXD
1
2
3
4
5
6
7
8
9
RTS
CTS
NC
Female DB9 connector that interfaces to the HC08 internal SCI1 serial
port via the U2 RS232 transceiver. It provides simple 2 wire asynchro-
nous serial communications without flow control. Flow control is provided
at test points on the board.
Pins 1, 4, and 6 are connected together.
15
J U N E
2 0 ,
2 0 0 5