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Bit bus width, Figure 4-12, External – FUJITSU MB91460 SERIES FR60 User Manual

Page 564: Example of connection with external devices, A) word access (b) halfword access (c) byte access

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Chapter 31 External Bus

4.Endian and Bus Access

8-bit bus width

Figure 4-12 External Bus Access for 8-Bit Bus Width

Example of Connection with External Devices

Figure 4-13

"Example of Connecting the MB91460 Series to External Devices" shows an example of connection

the MB91460 series to external devices.

11

10

01

00

11

10

01

00

11

10

01

00

11

10

01

00

(a) PA1/PA0="00"
(1) Output A1/A0="00"

(b) PA1/PA0="01"
(1) Output A1/A0="00"

(c) PA1/PA0="10"
(1) Output A1/A0="10"

(d) PA1/PA0="11"
(1) Output A1/A0="10"

(1)

(1)

(1)

(1)

LSB

MSB

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10

01

(1)

(2)

(3)

(4)

(1)

(2)

(3)

(4)

(1)

(2)

(3)

(4)

(1)

(2)

(3)

(4)

8bit

00

11

10

01

00

11

10

01

00

11

10

01

00

(a) PA1/PA0="00"
(1) Output A1/A0="00"
(2) Output A1/A0="01"
(3) Output 1/A0="10"
(4) Output 1/A0="11"

(b) PA1/PA0="01"
(1) Output A1/A0="00"
(2) Output A1/A0="01"
(3) Output 1/A0="10"
(4) Output 1/A0="11"

(c) PA1/PA0="10"
(1) Output A1/A0="00"
(2) Output A1/A0="01"
(3) Output 1/A0="10"
(4) Output 1/A0="11"

(d) PA1/PA0="11"
(1) Output A1/A0="00"
(2) Output A1/A0="01"
(3) Output 1/A0="10"
(4) Output 1/A0="11"

(A) Word access

(B) Halfword access

(C) Byte access

11

10

01

00

11

10

01

00

11

10

01

00

11

10

01

00

(a) PA1/PA0="00"
(1) Output A1/A0="00"
(2) Output A1/A0="01"

(b) PA1/PA0="01"
(1) Output A1/A0="00"
(2) Output A1/A0="01"

(c) PA1/PA0="10"
(1) Output A1/A0="10"
(2) Output A1/A0="11"

(d) PA1/PA0="11"
(1) Output A1/A0="10"
(2) Output A1/A0="11"

(1)

(2)

(1)

(2)

(1)

(2)

(1)

(2)