IXXBB1 Fujitsu Microelectronics, Inc., IXXBB1 Datasheet - Page 22

• Manufacturer Part Number: IXXBB1
• Description: 32-bit Proprietary Microcontroller Cmos Fr60 Mb91301 Series
• Manufacturer: Fujitsu Microelectronics, Inc.

22
MB91301 Series
Operation at start-up
External clock input at start-up
Output indeterminate at power-on time
Built-in DC/DC regulator
Note on use of the A/D converter
MB91301 series
HANDLING DEVICES
Always apply a settings initialization (INIT) to the INIT pin immediately after turning on the power.
Also, in order to provide a delay while the oscillator circuits stabilize immediately after start-up, maintain the “L”
level input to the INIT pin for the required stabilization delay time. (The initialization processing (INIT) triggered
by the INIT pin initializes the oscillation stabilization delay time to the minimum setting.)
At power-on start-up, always input a clock signal until the oscillation stabilization delay time is ended.
When the power is turned on, the output pin may remain indeterminate until the internal power supply becomes
stable.
This device has a built-in regulator, requiring 3.3 V input to the Vcc pin and a bypass capacitor of approximately
4.7 F connected to the C pin for the regulator.
As the MB91301 series contains an A/D converter, be sure to supply power to AVcc at 3.3 V and insert a capacitor
of at least 0.05 F between the AVR pin and the AVss/AVRL pin.
3.3 V
GND
0.05 µF
3.3 V
0.05 µF
Note of built-in DC/DC regulator
Note on Use of A/D Converter
V
AV
AVRH
AVR
AV
V
CC
SS
CC
SS
/AVRL
AV
AVRH
AVR
AV
CC
SS
MB91301 series
/AVRL
MB91301 series
V
SS
C
4.7 µF