Hardware; Power Supply - Fujitsu MB88121 Application Note

2 Hardware

This chapter discusses the Hardware related issues
Connection examples for 16-bit none-multiplexed and 16-bit multiplexed bus interface based
on MB91F467D and MB88121B are shown in chapter Appendix.

2.1 Power supply

MB91460 series has the ability to supply the GPIO (VDD5) and the external bus interface
(VDD35=3.3V) with different voltage level simultaneously. This is useful when using 3.3V
memory devices and 5V based components at Port functions.
Pin Nr
26,52,208
78,104,130,156 VDD5
The MB88121 series is using single voltage supply. All pins having the same voltage level
which are supplied at Vcc pins. In case of using the interrupt functionality the interrupt pins of
MB88121 and the input pins (e.g. external interrupt) have same voltage level, if not level
conversion via level shifter is required. The same applies to the Reset pin when using one
reset connection for MCU and CC.
CC pin MCU pin
VCC VDD35
3.3V 3.3V
3.3V 3.3V
5V 5V
Note:
Be aware of the required voltage levels of all pins. Level conversion for interrupt /
reset pins might be required.
© Fujitsu Microelectronics Europe GmbH
Interfacing MB91460 TO MB88121
Chapter 2 Hardware
Name Description
VDD35 External bus voltage supply
MCU voltage supply
Table 2-1 MB91F467D power supply pins
MCU pin
Changes if the interrupt function is used
VDD5
Use additional level shifter for the interrupt line / Reset
5V
3.3V
5V
Table 2-2 Relationship of the power supply
(3.3V CC => 5V MCU)
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Range
3V—5.5V
3V—5.5V
MCU-AN-300016-E-V10