UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 273

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

18.6.3 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
18.6.4 Power supply
programmer.
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
Supply AV
REF
with the same power supply as that in the normal operation mode.
DD
78K0S/KA1+
pin to V
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
memory programmer. Therefore, isolate the signal of the reset signal
of the flash memory programmer, and the V
Figure 18-6. Signal Collision (RESET Pin)
Signal collision
CHAPTER 18 FLASH MEMORY
User’s Manual U16898EJ5V0UD
Reset signal generator
Dedicated flash memory 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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