SHARP&PC-G850V(S)&&User&Manual&-&Appendix!A:!11-Pin!Interface&
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PIC-Mode&
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The PIC-mode of the PC-G850V(S) is used for the transfer of an assembled PIC-
program to a PIC microcontroller. This process is called PIC-programming, PIC-program
(up)loading or PIC-burning, since a specific “burning” voltage is needed that is much
higher than normal operating voltage. This mode is activated by the PIC-loader menue
item in the PIC-assembler sub-menue only. The PC-G850V(S) supports the ICSP-
protocol (In-Circuit Serial Programming) of the PIC16F8x microcontroller family and
compatible models.
The pin-out and signal semantics of the 11-pin interface in PIC-mode is as follows:
This signal controls the ICSP-programming mode of the
PIC. If this signal is HIGH, the burning voltage (+12 to
+14V) must be provided at the MCLR#-pin of the PIC.
If this signal is LOW, the MCLR#-pin must be at GND-
level or VDD (+5V).
This signal provides the ICSP-clock-pulse for the PIC to
be programmed. However the inverted CLK# (i.e. CLK)
signal must be provided at the RB6-input-pin of the PIC.
The latter latches data bits on the falling edge of that
CLK-pulse.
This input must be connected with the RB7-pin of the
PIC. Data is read from the PIC over this line for
verification of the programming process.
This output is used for serial data and command transfer
to the PIC in ICSP-mode. It has to be connected with the
RB7-pin of the PIC too.
This digital input can be connected to a programming
voltage monitoring circuit (esp. when using an external
supply). LOW (logic 0) means „weak voltage supply“.
Due to the specification of the PIC16F8x family, the PIC performs a transition to ICSP-
mode, if and only if all of the following conditions are true:
• VDD = +5V, VSS = GND
• MCLR# = +12V to +14V
• RB6 (CLK) = LOW.
• RB7 (DATA) = LOW.
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