152
Chapter 4
Bus Control Function (
μ
PD70F3187 only)
User’s Manual U16580EE3V1UD00
4.5.2 Bus
sizing
function
The bus sizing function controls data bus width for each CS area. The data bus width is specified by
using the bus size configuration register (BSC).
(1)
Bus size configuration register (BSC)
This register can be read/written in 16-bit units.
Caution:
Write to the BSC register after reset, and then do not change the set value. Also, do
not access an external memory area other than that for this initialization routine until
initial setting of the BSC register is finished. However, it is possible to access
external memory areas whose initialization has been finished.
Figure 4-4:
Bus Size Configuration Register (BSC)
After reset:
AAAAH
R/W
Address:
FFFFF066H
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
BSC
BS71 BS70 BS61 BS60 BS51 BS50 BS41 BS40 BS31 BS30 BS21 BS20 BS11 BS10 BS01 BS00
CS7
CS6
CS5
CS4
CS3
CS2
CS1
CS0
BEn1
BEn0
Data Bus Width of CSn Area
0
0
8 bits
0
1
16 bits
1
0
32 bits
1
1
Setting prohibited
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 ...
Page 1053: ......