Development Board User's Manual

MODE SWITCH

The 3 to 5 position MODE SWITCH on the PM12xxx Module provides an easy method of

configuring the HC12 operating Mode and Options from RESET.

NOTE: Expanded Narrow Mode is not available on this board, Expanded Wide

operation is required due to the memory application and that any expanded bus

operation requires both HC12 I/O ports A and B in any case.

Following are the Mode Switch selections and descriptions:

PM12D60

Default: 1 and 2 ON, 3 - 5 OFF.

MODE

SWITCH

SELECTION

OPTION

OFF POSITION ON POSITION

1 and 2 Operating Mode Single Chip Mode Expanded Wide Mode

3 Port H pull device Port H Pull-Down Port H Pull-Up

4 Port G pull device Port G Pull-Down Port G Pull-Up

5 Oscillator Select Ext. 16Mhz Clock User applied crystal

PM12DG128 / PM12DT128

Default: 1 and 2 ON, 3 OFF

MODE

SWITCH

SELECTION

OPTION

OFF POSITION ON POSITION

1 and 2 Operating Mode Single Chip Mode Expanded Wide Mode

3 Oscillator Select Ext. 16Mhz Clock User applied crystal

PM12DP256

Default: 1 - 3 ON, 4 and 5 OFF

MODE

SWITCH

SELECTION

OPTION

OFF POSITION ON POSITION

1 and 2 Operating Mode Single Chip Mode Expanded Wide Mode

3 MODC Selection Normal Modes Special / Emulation Mode

4 ROMON Select Internal Flash ON Internal Flash OFF

5 Oscillator Select Ext. 16Mhz Clock User applied crystal