upd78f0103 Renesas Electronics Corporation., upd78f0103 Datasheet - Page 353

• Manufacturer Part Number: upd78f0103
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

21.5.3 RESET pin
signal generator on the board, signal collision takes place. To prevent this collision, isolate the connection with the
reset signal generator.
memory will not be correctly programmed. Do not input any signal other than the reset signal of the dedicated flash
programmer.
21.5.4 Port pins
same status as that immediately after reset. If external devices connected to the ports do not recognize the port
status immediately after reset, the port pin must be connected to V
21.5.5 Other signal pins
inverse signal to X2.
21.5.6 Power supply
the V
monitor function with the flash programmer.
If the reset signal of the dedicated flash programmer is connected to the RESET pin that is connected to the reset
If the reset signal is input from the user system while the flash memory programming mode is set, the flash
When the flash memory programming mode is set, all the pins not used for flash memory programming enter the
Connect X1 and X2 in the same status as in the normal operation mode when using the on-board clock.
To input the operating clock from the programmer, however, connect the clock out of the programmer to X1, and its
To use the supply voltage output of the flash programmer, connect the V
To use the on-board supply voltage, connect in compliance with the normal operation mode.
However, be sure to connect the V
Supply the same other power supplies (AV
SS
pin to V
SS
of the flash programmer.
PD78F0103
RESET
In the flash memory programming mode, the signal output by the reset
signal generator collides with the signal output by the dedicated flash
programmer. Therefore, isolate the signal of the reset signal generator.
Figure 21-16. Signal Collision (RESET Pin)
Signal collision
DD
and V
REF
CHAPTER 21
User’s Manual U15836EJ5V0UD
SS
and AV
pins to V
Reset signal generator
SS
) as those in the normal operation mode.
Dedicated flash programmer
connection signal
DD
PD78F0103
Output pin
and GND of the flash programmer to use the power
DD
or V
SS
DD
via a resistor.
pin to V
DD
of the flash programmer, and
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