UPD78F0413GA-GAM-AX NEC, UPD78F0413GA-GAM-AX Datasheet - Page 514

• Manufacturer Part Number: UPD78F0413GA-GAM-AX
• Description: 8BIT UC, 32K FLASH, 1KB RAM, LCD
• Manufacturer: NEC

Specifications of UPD78F0413GA-GAM-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 30
• Ram Memory Size: 1024Byte
• Cpu Speed: 10MHz
• No. Of Timers: 8
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 32KB
• Oscillator Type: External, Internal

(1) Signal collision
(2) Malfunction of other device
514
If the dedicated flash memory programmer (output) is connected to a pin (input) of a serial interface connected to
another device (output), signal collision takes place. To avoid this collision, either isolate the connection with the
other device, or make the other device go into an output high-impedance state.
If the dedicated flash memory programmer (output or input) is connected to a pin (input or output) of a serial
interface connected to another device (input), a signal may be output to the other device, causing the device to
malfunction. To avoid this malfunction, isolate the connection with the other device.
78K0/LC3
78K0/LC3
78K0/LC3
Input pin
Pin
Pin
Figure 24-6. Signal Collision (Input Pin of Serial Interface)
In the flash memory programming mode, the signal output by the device
collides with the signal sent from the dedicated flash programmer.
Therefore, isolate the signal of the other device.
If the signal output by the 78K0/LC3 in the flash memory programming
mode affects the other device, isolate the signal of the other device.
If the signal output by the dedicated flash memory programmer in the flash
memory programming mode affects the other device, isolate the signal of
the other device.
Figure 24-7. Malfunction of Other Device
Signal collision
CHAPTER 24 FLASH MEMORY
User’s Manual U18698EJ1V0UD
Dedicated flash memory
programmer connection pin
Dedicated flash memory
programmer connection pin
Dedicated flash memory
programmer connection pin
Other device
Other device
Other device
Output pin
Input pin
Input pin