Software; Bus Interface Setup; Simplified Timing Diagram Of The Mb88121B (None Multiplexed Access) - Fujitsu MB88121 Application Note

3 Software

This chapter discusses the Software related issues

3.1 Bus interface setup

To access the MB88121 register in application these registers needs to be visible in the
MCU address range. For that reason the bus interface needs to be setup. All these settings
are available in start91460.asm file for MB91460 series MCU.
Following needs to be done:
•
Initialise Bus interface for required signal timing
•
Ensure Port function is set to Bus interface
•
Setup of Bus interface Clock (CLKT)

3.1.1 Simplified timing diagram of the MB88121B (none multiplexed access)

When using 16-bit none multiplexed mode The MB88121B requires following timing. This
timing need to be setup in the Bus interface register at MCU side.
© Fujitsu Microelectronics Europe GmbH
Interfacing MB91460 TO MB88121
Chapter 3 Software
Figure 3-1 MB88121 read operation (non-multiplexed)
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