180
Chapter 4
Bus Control Function (
μ
PD70F3187 only)
User’s Manual U16580EE3V1UD00
4.9 Boundary Operation Conditions
4.9.1 Program
space
Branching to the on-chip peripheral I/O area is prohibited. If the above is performed, undefined data is
fetched, and fetching from the external memory is not performed.
4.9.2 Data
space
The V850E/PH2 is provided with an address misalign function.
Through this function, regardless of the data format (word, halfword or byte), data can be allocated to
all addresses. However, in the case of word data and halfword data, if the data is not subject to
boundary alignment, the bus cycle will be generated at least 2 times and bus efficiency will drop.
(1)
External bus width: 16 bits
(a) In the case of halfword-length data access
When the address’s LSB is 1, a byte-length bus cycle will be generated 2 times.
(b) In the case of word-length data access
•
When the address’s LSB is 1, bus cycles will be generated in the order of byte-length bus cycle,
halfword-length bus cycle, and byte-length bus cycle.
•
When the address’s lower 2 bits are 10B, a halfword-length bus cycle will be generated 2 times.
(2)
External bus width: 32 bits
(a) In the case of halfword-length data access
When the address’s lower 2 bits are 11B, a byte-length bus cycle will be generated 2 times.
(b) In the case of word-length data access
When the address’s lower 2 bits are 10B, a halfword-length bus cycle will be generated 2 times.
Summary of Contents for MuPD70F3187
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 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 ...
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