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C M L - 1 2 C 3 2
J U L Y
2 6 ,
2 0 0 4
Power Connectors
Power connectors J1 and TB1 provide power input to the board. Voltage input should be lim-
ited to the range of +6VDC to +16VDC with +9VDC typical. Voltage should be applied to the
board at either J1 or TB1 but not both. Applying input voltage to both input connectors at the
same time will cause a supply conflict and damage the CML-12C32 may result.
Connector J1 accepts a standard 2.1mm barrel plug connector with positive voltage center.
Connector TB1 accepts 18G – 24G solid copper wire. TB1 may also be used to gain access to
on-board power levels +Vin, GND, or +5VDC for off-board use. The +5VDC output may be
used to power off-board circuitry if desired. However, the voltage regulator output is internally
limited to 250 mA.
BUS_PORT
The BUS_PORT provides access to Port E signal and to latched address signals. Care should
be taken when using these signals. Excessive load may adversely affect MCU operation.
PE0/XIRQ*
PE2/RW*
PE4/ECLK
PE6/MODB
+5
A0
A2
A4
A6
A8
A10
A12
A14
POT
1
3
5
7
9
11
13
15
17
19
21
23
25
27
2
4
6
8
10
12
14
16
18
20
22
24
26
28
PE1/IRQ*
PE3/LSTRB*
PE5/MODA
PR7/XCLKS*
GND
A1
A3
A5
A7
A9
A11
A13
A15
GND
A[15..0] Latched Memory Addresses 0 to 15.
PE[7..0] MCU expanded bus control signals
BDM PORT
The BDM port is a 6-pin header compatible with the Motorola Background Debug Mode (BDM)
Pod. This allows the connection of a background debugger for software development, pro-
gramming and debugging in real-time without using HC12 I/O resources.
BGND
NC
NC
1
3
5
2
4
6
GND
/RESET
+5V
See the HC12 Technical Reference Manual for
complete documentation of the BDM.
A Background Debug Module is available from the Axiom Manufacturing.
13
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