upd78f0124m6gba1-8et Renesas Electronics Corporation., upd78f0124m6gba1-8et Datasheet - Page 407

• Manufacturer Part Number: upd78f0124m6gba1-8et
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

25.5.3 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.
25.5.4 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
25.5.5 REGC pin
25.5.6 Other signal pins
inverse signal to X2.
25.5.7 Power supply
the V
the voltage is monitored by 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 the REGC pin in the same manner as during normal operation.
•
•
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 power supply output of the flash programmer, connect the V
To use the on-board power supply, connect in compliance with the normal operation mode.
However, be sure to connect the V
Supply the same other power supplies (EV
µ
µ
SS
PD78F0124, 78F0124(A): Connect directly to V
PD78F0124(A1):
pin to V
SS
of the flash programmer.
µ
PD78F0124
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.
Connect directly to V
Figure 25-16. Signal Collision (RESET Pin)
DD
Signal collision
and V
CHAPTER 25
DD
User’s Manual U16315EJ3V1UD
SS
, EV
pins to V
SS
, AV
DD
DD
Reset signal generator
or connect to GND via a 1
DD
REF
Dedicated flash programmer
connection pin
and GND of the flash programmer, respectively, because
, and AV
PD78F0124
Output pin
DD
or V
SS
) as those in the normal operation mode.
SS
DD
via a resistor.
pin to V
µ
F capacitor
DD
of the flash programmer, and
407