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