Power-On - Fujitsu MB91150 Series Hardware Manual

2.3

Power-On

This section provides notes on power-on and notes applicable when the clock function
is not used.
I Notes on power-on
❍ Power-on
At power-on, be sure to start the RST pin at the L level. After the power supply level becomes
the V
CC
elapsed, then set the RST pin to the H level.
❍ Oscillation input
At power-on, be sure to continue inputting clock signals until the oscillation stabilization wait
status is released.
❍ Power-on reset
Be sure to perform a power-on reset to turn on power. Perform a power-on reset also when
powering on again if the power supply voltage has dropped to less than the voltage for assuring
operation.
❍ Power on order
Turn on power in the order of V
❍ A/D converter
Even when the A/D converter is not used, connect AV
level.
❍ D/A converter
Even when the D/A converter is not used, connect DAVC to the V
level.
level, wait until the time for at least five cycles of the internal operating clock has
CC
CHAPTER 2 HANDLING THE DEVICE
--> AV --> AVRH, and turn off power in the reverse order.
CC
to the V
CC
level and AV to the V
CC SS
level and DAVS to the V
CC
SS
SS
27