Motorola MCU 68HC912D60 - Manual (Page 10)

10
CONFIG SWITCH
The CME-12D60 board is shipped from the manufacturer with the following default CONFIG
SWITCH settings:
1 2 3 4 5 6 7 8
ON ON ON ON OFF ON OFF OFF
The 8 position CONFIG SWITCH provides an easy method of configuring the CME-12D60
board operation. Following are the configuration switch descriptions and HC12 I/O port
usage:
CONFIG
SWITCH
OPERATION when in ON position I/O PORT USED
1 MODE A selection (see Mode chart below) MODA / PE5
2 MODE B selection (see Mode chart below) MODB / PE6
3 EXT – External Memory enable
(1)
PORT A, B, Ext. Bus
4 MON – Monitor Memory enable
(2)
N/A
5 VPP - Flash VPP voltage enable N/A
6 RXD0 – COM1 Serial Port RXD0 input enable PS0 / RXD0
7 RXD1 – COM2 Serial Port RXD1 input enable PS3 / RXD1
8 CAN Port RX enable PCAN0
(1)
Enables memory bus operation for access to board memory. Expanded bus must be
on for proper operation.
(2)
Enables monitor EPROM’s in memory map at 0xC000 – FFFF hex if CONFIG
SWITCH position 3 is also on. When in off position memory space is SRAM for BDM
use.
MODE CHART
Single Chip Mode MOD A and B = OFF Boot from Internal Flash
Expanded Wide Mode MOD A and B = ON Boot from External Memory
NOTE: Expanded Narrow Mode is not available on this board.