155
Chapter 4
Bus Control Function (
μ
PD70F3187 only)
User’s Manual U16580EE3V1UD00
4.5.4 Bus
width
The V850E/PH2 accesses peripheral I/O and external memory in 8-bit, 16-bit, or 32-bit units. The fol-
lowing shows the operation for each type of access. Access all data in order starting from the lower
order side.
(1)
Byte access (8 bits)
(a) When the data bus width is 32 bits (Little Endian)
(b) When the data bus width is 16 bits (Little Endian)
<1> Access
to
address (4n)
<2> Access
to
address (4n+1)
<3> Access
to
address (4n+2)
<4> Access
to
address (4n+3)
7
0
7
0
15
8
23
16
31
24
Byte data
External
data bus
Address
4n
7
0
7
0
15
8
23
16
31
24
Byte data
External
data bus
Address
4n + 1
7
0
7
0
15
8
23
16
31
24
Byte data
External
data bus
Address
4n + 2
7
0
7
0
15
8
23
16
31
24
Byte data
External
data bus
Address
4n + 3
<1> Access
to
address (4n)
<2> Access
to
address (4n+1)
<3> Access
to
address (4n+2)
<4> Access
to
address (4n+3)
7
0
7
0
Byte data
15
8
External
data bus
4n
Address
7
0
7
0
15
8
4n + 1
Address
Byte data
External
data bus
7
0
7
0
Byte data
15
8
External
data bus
4n + 2
Address
7
0
7
0
15
8
4n + 3
Address
Byte data
External
data bus
Summary of Contents for V850E/PH2
Page 6: ...6 Preface User s Manual U16580EE3V1UD00...
Page 16: ...16 User s Manual U16580EE3V1UD00...
Page 28: ...28 User s Manual U16580EE3V1UD00...
Page 32: ...32 User s Manual U16580EE3V1UD00...
Page 84: ...84 Chapter 2 Pin Functions User s Manual U16580EE3V1UD00 MEMO...
Page 144: ...144 Chapter 3 CPU Functions User s Manual U16580EE3V1UD00 MEMO...
Page 192: ...192 Chapter 5 Memory Access Control Function PD70F3187 only User s Manual U16580EE3V1UD00 MEMO...
Page 312: ...312 Chapter 9 16 Bit Timer Event Counter P User s Manual U16580EE3V1UD00 MEMO...
Page 534: ...534 Chapter 11 16 bit Timer Event Counter T User s Manual U16580EE3V1UD00...
Page 969: ...969 Chapter 20 Port Functions User s Manual U16580EE3V1UD00 MEMO...
Page 970: ...970 Chapter 20 Port Functions User s Manual U16580EE3V1UD00...
Page 976: ...976 Chapter 22 Internal RAM Parity Check Function User s Manual U16580EE3V1UD00 MEMO...
Page 984: ...984 Chapter 23 On Chip Debug Function OCD User s Manual U16580EE3V1UD00 MEMO...
Page 1006: ...1006 Chapter 24 Flash Memory User s Manual U16580EE3V1UD00 MEMO...
Page 1036: ...1036 Chapter 27 Recommended Soldering Conditions User s Manual U16580EE3V1UD00 MEMO...
Page 1046: ...1046 Appendix A Index User s Manual U16580EE3V1UD00 MEMO...
Page 1052: ...1052 User s Manual U16580EE3V1UD00...
Page 1053: ......