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.
Содержание MuPD70F3187
Страница 6: ...6 Preface User s Manual U16580EE3V1UD00 ...
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Страница 84: ...84 Chapter 2 Pin Functions User s Manual U16580EE3V1UD00 MEMO ...
Страница 144: ...144 Chapter 3 CPU Functions User s Manual U16580EE3V1UD00 MEMO ...
Страница 192: ...192 Chapter 5 Memory Access Control Function μPD70F3187 only User s Manual U16580EE3V1UD00 MEMO ...
Страница 312: ...312 Chapter 9 16 Bit Timer Event Counter P User s Manual U16580EE3V1UD00 MEMO ...
Страница 534: ...534 Chapter 11 16 bit Timer Event Counter T User s Manual U16580EE3V1UD00 ...
Страница 969: ...969 Chapter 20 Port Functions User s Manual U16580EE3V1UD00 MEMO ...
Страница 970: ...970 Chapter 20 Port Functions User s Manual U16580EE3V1UD00 ...
Страница 976: ...976 Chapter 22 Internal RAM Parity Check Function User s Manual U16580EE3V1UD00 MEMO ...
Страница 984: ...984 Chapter 23 On Chip Debug Function OCD User s Manual U16580EE3V1UD00 MEMO ...
Страница 1006: ...1006 Chapter 24 Flash Memory User s Manual U16580EE3V1UD00 MEMO ...
Страница 1036: ...1036 Chapter 27 Recommended Soldering Conditions User s Manual U16580EE3V1UD00 MEMO ...
Страница 1046: ...1046 Appendix A Index User s Manual U16580EE3V1UD00 MEMO ...
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