10
CONFIG SWITCH
The CME-12B/BC board is shipped from the manufacturer with the following default CONFIG
SWITCH settings:
1234 567 8
ON ON ON ON OFF ON OFF OFF
The 8 position CONFIG SWITCH provides an easy method of configuring the CME-12B/BC32
board operation. Following are the configuration switch descriptions and HC12 I/O port
usage:
CONFIG
SWITCH OPERATION when in ON position HC12 I/O PORT USED
1MODE A selection (see Mode chart
below) MODA / PE5
2MODE B selection (see Mode chart
below) MODB / PE6
3EXT –External Memory enable (1) N/A
4MON –Monitor Memory enable (2) N/A
5VPP - Flash VPP voltage enable N/A
6RXD - Serial Port RXD input enable PS0 / RXD
7PC0 –CAN Port RXCAN enable PC0
8PC1 –CAN Port TX enable PC2
(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 0x8000 – 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 A and B = OFF
Expanded Wide Mode A and B = ON
MEM-SEL JUMPERS
Memory sockets U4/5 are shipped with 32K byte RAM devices. U6/7 are shipped with 32K
byte EPROM devices programmed with the D-bug12 monitor.
1,3,4 IN: enables RAM or EEPROM, 32K devices to U6/7
1,3 IN: enables RAM or EEPROM, 8K devices in U6/7
2,4 IN: enables EPROM, 8K or 32K devices in U6/7 (Default)