UPD78F0138 NEC, UPD78F0138 Datasheet - Page 451

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

27.6.3 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.
27.6.4 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
27.6.5 REGC pin
27.6.6 Other signal pins
inverse signal to X2.
27.6.7 Power supply
the V
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
Handle 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 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.
Supply the same other power supplies (EV
Caution In the dedicated flash programmer PG-FP3 or FL-PR3, V
µ
µ
SS
PD78F0134, 78F0138, 78F0134(A), 78F0138(A):
PD78F0134(A1), 78F0138(A1):
pin to V
sure to connect V
SS
of the flash programmer.
PD78F0134, 78F0138
RESET
DD
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.
and V
Figure 27-17. Signal Collision (RESET Pin)
CHAPTER 27
Signal collision
SS
to V
DD
User’s Manual U16228EJ2V0UD
, EV
DD
and GND of the dedicated flash programmer.
SS
, AV
µ
PD78F0134, 78F0138
Connect directly to V
Connect directly to V
REF
Reset signal generator
Dedicated flash programmer
connection signal
, and AV
Output pin
DD
or V
SS
) as those in the normal operation mode.
SS
DD
via a resistor.
DD
DD
pin to V
DD
has a power monitor function. Be
or connect to GND via a 1
DD
of the flash programmer, and
µ
F capacitor
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