CHAPTER 17
µ
PD78E9860A, 78E9861A
User’s Manual U14826EJ5V0UD
164
17.1.3 On-board pin processing
When performing programming on the target system, provide a connector on the target system to connect the
dedicated flash programmer.
An on-board function that allows switching between normal operation mode and EEPROM programming mode
may be required in some cases.
<V
PP
pin>
In normal operation mode, input 0 V to the V
PP
pin. In EEPROM programming mode, a write voltage of 10.0 V
(TYP.) is supplied to the V
PP
pin, so perform either of the following.
(1) Connect a pull-down resistor RV
PP
= 10 k
Ω
to the V
PP
pin.
(2) Use the jumper on the board to switch the V
PP
pin input to either the programmer or directly to GND.
A V
PP
pin connection example is shown below.
Figure 17-4. V
PP
Pin Connection Example
PD78E9860A, 78E9861A
V
PP
Connection pin of dedicated flash programmer
Pull-down resistor (
RV
PP
)
µ
<Serial interface pins>
The following shows the pins used by the serial interface.
Serial Interface
Pins Used
Pseudo 3-wire
P02, P01, P00
When connecting the dedicated flash programmer to a serial interface pin that is connected to another device on-
board, signal conflict or abnormal operation of the other device may occur. Care must therefore be taken with such
connections.
Содержание PD789860
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