Motorola 68HC912 User Manual
14
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.
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.
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