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•
Even if the SIN4, SOT4, and SCK4 pins are used for the user system, the control circuit shown in the
figure below is required. The /TICS signal of the flash microcontroller programmer can be used to
disconnect the user circuit during serial programming.
•
Connect the AF220/AF210/AF120/AF110 while the user power is off.
•
When the programming power is supplied from the AF220/AF210/AF120/AF110, be careful not to
short-circuit the user power supply.
Figure 29.5-2 Connecting User Circuitry (Detail)
AF220/AF210/
AF120/AF110
write control pin
AF220/AF210/
AF120/AF110
/TICS pin
CHAPTER 29 EXAMPLES OF SERIAL PROGRAMMING CONNECTION
10k
User circuit
MB90F394H
write control pin
603
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