Motorola MC9S12DP256 BDM Port, Test Points, See the HC12 Technical Reference Manual for complete

C M L 1 2 S D P 2 5 6 0 7 / 1 7 / 0 2

NOTES:

1)The LCD write requires 3 SPI transfers. Transfer 1 provides data 0 - 3 and RS (register select) value. Transfer 2 provides the same data with the EN (D7) bit set. Transfer 3 provides same data with the EN bit clear.

2)Resistor R25 can be removed to apply and external VEE potential.

3)CUT-AWAY 1 - 3 provide a means to isolate the LCD Port from the HCS12 SPI channel.

BDM PORT

The BDM port is a 6 pin header compatible with the Motorola Background Debug Mode (BDM) Pod. This allows the connection of a background debugger for software development, programming and debugging in real-time without using HC12 I/O resources.

BGND

1	2	GND	See the HC12 Technical Reference Manual for complete
3	4	/RESET	documentation of the BDM.
5	6	+5V

A Background Debug Module is available from the manufacturer.

TEST POINTS

The following test points are provided on the development board:

EXTAL : HCS12 oscillator or external clock input pin.

XTAL : HCS12 oscillator output pin.

XFC : HCS12 PLL reference voltage and filter.

VDDPLL : HCS12 PLL voltage source test point.

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