Fujitsu FR60 Hardware Manual page 212

32-bit microcontroller mb91301 series

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Table of Contents

CHAPTER 4 EXTERNAL BUS INTERFACE

■ Data Format

The relationship between the internal register and external data bus is as follows:

❍ Word access (when executing the LD/ST instructions)

Figure 4.4-14 Relationship between the Internal Register and External Data Bus for Word Access

❍ Halfword access (when executing the LDUH/STH instructions)

Figure 4.4-15 Relationship between Internal Register and External Data Bus for Halfword Access

a) Output address low-order digits "00

Internal register External bus

❍ Byte access (when executing the LDUB/STB instructions)

Figure 4.4-16 Relationship between Internal Register and External Data Bus for Byte Access

a) Output address

low-order digits "00

Internal register

b) Output address

low-order digits "01

External bus

b) Output address l ow-order digits "10

Internal register External bus

c) Output address

low-order digits "10

d) Output address

low-order digits "11