Vpp ( Μ Pd78F9801 Only); Ic (Mask Rom Version Only) - NEC switch User Manual

( µ µ µ µ PD78F9801 only)
2.2.12 V
PP
A high voltage should be applied to this pin when the flash memory programming mode is set and when the
program is written or verified.
Handle this pin in either of the following ways.
• Independently connect a 10 kΩ pull-down resistor.
• Switch this pin to be directly connected to the dedicated flash programmer in programming mode or to V
normal operation mode using a jumper on the board.

2.2.13 IC (mask ROM version only)

The IC (Internally Connected) pin is used to set the µ PD789800 Subseries in the test mode before shipment. In
the normal operation mode, directly connect this pin to the V
If a potential difference is generated between the IC pin and V
pin and V pin or an external noise superimposed on the IC pin, a user program may not run correctly.
SS0
32
CHAPTER 2 PIN FUNCTIONS
pin with as short a wiring length as possible.
SS0
• Directly connect the IC pin to the V
V IC
SS0
User's Manual U12978EJ3V0UD
pin due to a long wiring length between the IC
SS0
pin.
SS0
Keep short
in
SS0