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COM1
1
TXD0 2 6
RXD0 3 7
4 8
GND 5 9
Pins 1, 4, and 6 are connected for default handshake standards.
Pins 7 and 8 are connected for default handshake standards.
Handshake pins can be easily isolated and connected to I/O ports if necessary.
COM2
1
2
TXD1 3
4
RXD1 5
6
7
8
GND 9 10
Pins 1, 2, and 7 are connected for default handshake standards.
Pins 4 and 6 are connected for default handshake standards.
ANALOG PORT
The ANALOG port provides access to the Port AD0 and Port AD1 Analog-to-Digital input lines
of the HC912D60 as follows:
PAD0
1 2
PAD1
3 4
PAD2
5 6
PAD3
7 8
PAD4
9 10 PAD14
PAD5 11 12 PAD15
PAD6 13 14 PAD16
PAD7 15 16 PAD17
VRL0 17 18 VRH0
VRL1 19 20 VRH1
VSSA 21 22 VDDA
GND 23 24 +5V
GND 25 26 +5V
The COM-1 port has a Female DB9 connector that interfaces to
the HC12 internal SCI0 serial port. It uses a simple 2 wire
asynchronous serial interface and is translated to RS232
signaling levels.
The COM-2 connector interfaces to the HC12 internal SCI1
serial port. It uses a simple 2 wire asynchronous serial interface
and is translated to RS232 signaling levels. This connector
supports a standard IDC ribbon cable to DB9 socket.
PAD10
PAD0 – PAD7 HC12 Port AD0 is an input port or A/D
PAD11
Converter inputs.
PAD12
PAD10 – PAD17 HC12 Port AD1 is an input port or A/D
PAD13
Converter inputs.
VRH / VRL HC12 A/D Converter Reference Pins. See
A/D Reference Section. To provide an external reference
voltage, R3,4,10 and 32 may need to be removed. See
schematic.
14
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