437
CHAPTER 23
µ
PD78F0354, 78F0354Y
User’s Manual U15798EJ2V0UD
23.3.3 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 flash memory programming mode
may be required in some cases.
<V
PP
pin>
In normal operation mode, input 0 V to the V
PP
pin. In flash memory 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 23-6. V
PP
Pin Connection Example
PD78F0354, 78F0354Y
V
PP
Connection pin of dedicated flash programmer
Pull-down resistor (RV
PP
)
µ
<Serial interface pin>
The following shows the pins used by the serial interface.
Serial Interface
Pins Used
3-wire serial I/O (SIO3)
SI3, SO3, SCK3
3-wire serial I/O (SIO3) with handshake
SI3, SO3, SCK3, P33 (HS)
3-wire serial I/O (CSI1)
SI1, SO1, SCK1
UART (UART0)
RxD0, TxD0
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 mPD780344 Series
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