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iPac HCS12 Manual.doc
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Rev 1.2 - 11/11/03
2.2.5 JP3
Serial1 Config
This jumper determines which interface Serial Port 1 utilizes. Place the jumper in the 232 position for use
as an RS 232 port and place the jumper in the 422 position for use as a RS 422/485 interface.
2.2.6 JB1
4 – 20 ma.
This jumper block allows the selection of any of the optional 12 bit A/D inputs to utilize 4 – 20 ma. inputs
instead of 0 – 5 volt inputs. Simply jumper the appropriate channel(s) to allow 4 – 20 ma. inputs. Each
jumper position has the channel number designated next to it.
2.2.7 JB2
VIN+ Config
This jumper block selects the iPac’s input voltage requirements. JB2 configures VIN+ to be a direct 5V
connection or a 9-14V connection. Setting this jumper incorrectly can damage the board. The two possible
configurations are as follows.
VIN+ = 9-14 Volts regulated on board (default). Both jumpers are in the V+ position.
2 – 4
1 – 3
VIN+ = 5V Direct voltage (no regulation). Both jumpers are in the 5 position.
4 – 6
3 – 5
2.3 JTAG & BDM
This multipurpose header provides a programming interface to the PLD which translates the bus signals as well as a
debugging interface directly to the Processor. Currently it is only used internally be EMAC.
Table 1: JTAG & BDM Interface (HDR10)
Pin
Signal
Pin
Signal
1
JTAG_TCK
2
GND
3
JTAG_TDO
4
5V (Vcc)
5
JTAG_TMS
6
CPU_RESET
7
NC/Reserved
8
BKGND
9
JTAG_TDI
10
GND
