ADuC824 Evaluation Board Reference Guide
(3) Link Options
Version 1.0
Analog Devices Inc., MicroConverter
Page 9 of 14
www.analog.com/microconverter
LK10 (3x1) RTD Excite
Function:
LK10 connects either the current source at pin 3 or the current source at pin 4 available from
the ADuC824, to excite the external RTD.
Use:
Slide LK10 to Position A
to connect the current from pin 3 to the RTD.
Slide LK10 to Position
B
to connect the current from pin 4 to the RTD.
Slide LK10 to Center Position
if the RTD temperature demonstration is not being used
LK11 (2x1) Connect AIN1 to RTD
Function:
Connects the high end of the external RTD circuit to AIN1.
Use :
Slide LK11 into the ON position
to connect the external RTD to AIN1.
Slide LK11 into the OFF position
to disconnect the RTD from AIN1.
LK12 (2x1) Connect AIN2 to RTD
Function :
Connects the low end of the external RTD circuit to AIN2.
Use :
Slide LK12 into the ON position
to connect the external RTD to AIN2.
Slide LK12 into the OFF position
to disconnect the RTD from AIN2.
LK13 (2x1) Connect PSEN to External Data Memory
Function :
Allows the External Data Memory to be used as both an External Program Memory and an
External Data Memory.
Use :
Slide LK13 into the ON position
to connect the PSEN output from the ADuC824 (for use
with an external program memory) through an AND gate to the external data memory. This
allows the external Data Memory to be used as
both
external program and data memory.
Note: To use this mode make remove any external program memory inserted in the external
program memory socket provided (U9) as this will cause confliction on the data bus.
Slide LK13 into the OFF position
to disconnect the PSEN signal from the data memory,
disabling the use of the external data memory as an external program memory.
