EV8000 datasheet(15/35 Pages) CMLMICRO

15 / 35 page

Evaluation Kit User Manual for FX828 and FX829

EV8000

UM8000/4

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

(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

(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

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