CHAPTER 16 FLASH MEMORY (
µµµµ
PD70F3107A)
524
User’s Manual U14359EJ4V0UM
The voltage applied to the V
PP
pin must satisfy the following conditions:
•
Hold the voltage applied to the V
PP
pin at 0 V in the normal operation mode and hold the V
PP
voltage only while
the flash memory is being manipulated.
•
The V
PP
voltage must be stable from before manipulation of the flash memory starts until manipulation is
complete.
Cautions 1. Apply 0 V to the V
PP
pin when reset is released.
2. Implement self-programming in single-chip mode 0 or 1.
3. Apply the voltage to the V
PP
pin in the entry program.
4. If both writing and erasing are executed by using the self-programming function and flash
memory programmer on the target board, be sure to communicate with the programmer
using CSI0 (do not use the handshake-supporting CSI).
Figure 16-6. Timing to Apply Voltage to V
PP
Pin
Flash memory
manipulation
RESET signal
V
PP
signal
V
PP
0 V
V
DD
0 V