UPD78F9502MA-CAC-A NEC, UPD78F9502MA-CAC-A Datasheet - Page 141

• Manufacturer Part Number: UPD78F9502MA-CAC-A
• Description: 8BIT MCU, 4K FLASH, 128B RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F9502MA-CAC-A

• Controller Family/series: UPD78F
• No. Of I/o's: 8
• Ram Memory Size: 128Byte
• Cpu Speed: 10MHz
• No. Of Timers: 2
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

14.6.2 RESET pin
the reset 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
memory programmer.
14.6.3 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
14.6.4 Power supply
programmer.
If the reset signal of the dedicated flash memory programmer is connected to the RESET pin that is connected to
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
The state of the pins in the self programming mode is the same as that in the HALT mode.
Connect the V
78F9501, 78F9502
DD
PD78F9500,
pin to V
RESET
DD
of the flash memory programmer, and the V
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 14-4. Signal Collision (RESET Pin)
Preliminary User’s Manual U18681EJ1V0UD
Signal collision
CHAPTER 14 FLASH MEMORY
Reset signal generator
Dedicated flash programmer
connection signal
Output pin
DD
or V
SS
via a resistor.
SS
pin to V
SS
of the flash memory
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