EV8000 Datasheet, PDF (15/35 Pages) CML Microcircuits – Evaluation Kit User

Evaluation Kit User Manual for FX828 and FX829
EV8000
1.6.2 Hardware Description - µC Board
1.6.2.1 Operating Voltage
Jumper JP1 is used to select the operating voltage. A link fitted at position 1,2 selects 3.3V
operation and at position 2,3 selects 5.0V operation (default). Do not operate this board with the
link on jumper JP1 removed.
1.6.2.2 Clock/Oscillator
A 4MHz xtal is the highest frequency xtal that may be used with a PIC16LC74(A)JW at
VDD = 3.3V. The PIC 16C74(A)JW has a similar limitation and is fitted for availability reasons.
Although rated at 5.0V, it has been found to work successfully at 3.3V. The links on jumpers JP2,
which are normally fitted, select an on-board 4MHz xtal. An external 3.58MHz clock, for
example, may be supplied to JP2_1 (1) once the links have been removed, taking care to adjust
any firmware timing routines accordingly.
1.6.2.3 RS232 Interface
The RS232 interface (connector J3) has its communications protocol determined by the µC
firmware. A suggested configuration is 8 data bits, no parity, 1 stop bit and 19,200 baud with
hardware handshake but without CR -> CR/LF conversion. The firmware supplied in the PIC µC
assumes this configuration.
1.6.2.4 Reset Switch (SW1)
This is provided to reset the PIC µC firmware, should this be required.
1.6.2.5 Programming Mode
TO ENTER PROGRAMMING MODE
(a) Remove power from board
(b) Disconnect the µC board from the signalling processor board
(c) Ensure the link on jumper JP1 is fitted in position 2,3 for VDD = 5.0V
(d) Remove link on jumper JP3
(e) Insert links on jumpers JP4, JP5, JP6 and JP7
(f) Re-apply power to board
(g) Connect the programming voltage (VPP = 12.5V to 13.5V) power supply between test point
TP5 (+ve) and VSS (-ve)
(h) Ensure the PIC µC programming utility PICPROGA.EXE is loaded into the PC under DOS
and the PC is connected to the µC board
(i) UV-erase the PIC µC first, then download firmware into the PIC µC and verify it
TO LEAVE PROGRAMMING MODE
(a) Remove power from board (including the programming voltage)
(b) Remove links on jumpers JP4, JP5, JP6 and JP7
(c) Insert a link on jumper JP3
(d) Reconnect the link on jumper JP1 to its original position
(e) Reconnect the µC board to the signalling processor board, checking that the voltage
selection jumpers are correctly set
(f) Ensure the ES8000 software is running on the PC under Windows
(g) Re-apply power to board and run the new µC firmware
© 2004 CML Microsystems Plc
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UM8000/4