Velleman К8048 - Manual (Page 15)

Experiments 13
K8048 © 2003 Velleman Components
8 ICSP
IICSP allows you to program controllers "in-circuit". This process is also known as code
downloading. This means quite simply that the chip in question is connected with a socket
consisting of four or five wires, viz. the ICSP bus. Several members of the PIC family can be
programmed or reprogrammed without having to remove them from the print or deactivating the
power supply. These IC's are converted to programming mode by applying the programming
voltage of 12 to 14V to the "/MCLR" pin. From this point onwards RB6 is used as a CLOCK input
while RB7 is modified into a DATA-input/output-connection.