17
17-13
Rev.1.0
(11) Bus Mode Control Register (BUSMODC)
The microcomputer contains a function to select between two external bus modes.
■
Bus Mode Control Register (BUSMODC)
<Address: H'0080 077F>
<When reset: H'00>
D
Bit Name
Function
R
W
8-14
No functions assigned
0
–
15
BUSMOD
0: WR signal separate mode
(Bus mode control)
1: Byte enable separate mode
D8
9
10
11
12
13
14
D15
BUSMOD
This register is used to facilitate memory connections during processor and external extended
modes.
When the bus mode control (BUSMOD) bit = 0, the WR signal is output separately for each byte
__ ___ ___ ____
____
area. When in this mode, the RD, BHW, BLW, BCLK, and WAIT signals can be used. When
connecting memory chips in boot mode, however, the Bus Mode Control Register has no effect, so
that the external bus interface operates assuming that the bus mode control (BUSMOD) bit = 0.
When the bus mode control (BUSMOD) bit = 1, the byte enable signal is output separately for
__ ___ ___ __
____
each byte area. When in this mode, the RD, BHE, BLE, WR, and WAIT signals can be used.
When a WAIT control circuit is configured, timing must be controlled external to the chip because
BCLK is not output.
CS0, CS1
DB0 – DB15
WAIT
RD
BHW
BLW
A14 – A30
DB0 – DB15
WAIT
RD
WR
BHE
BLE
A14 – A30
BCLK
BUSMOD=0
BUSMOD=1
CS0, CS1
A12/CS2
A13/CS3
A12/CS2
A13/CS3
Figure 17.1.1 Pin Functions when Bus Modes are Changed
EXTERNAL BUS INTERFACE
17.1 External Bus Interface Related Signals
Содержание 32172
Страница 20: ... This is a blank page 16 ...
Страница 21: ...1 1 Overview 1 2 Block Diagram 1 3 Pin Functions 1 4 Pin Layout CHAPTER 1 CHAPTER 1 OVERVIEW ...
Страница 44: ...1 1 24 Rev 1 0 This is a blank page Overview 1 4 Pin Layout ...
Страница 58: ...2 2 14 Rev 1 0 This is a blank page CPU 2 6 Data Formats ...
Страница 122: ...4 4 26 Rev 1 0 This is a blank page EIT 4 13 Precautions on EIT ...
Страница 200: ...7 7 6 Rev 1 0 This is a blank page RESET 7 4 Precautions to Be Taken Immediately after Reset ...
Страница 240: ...8 8 40 Rev 1 0 This is a blank page INPUT OUTPUT PORTS AND PIN FUNCTIONS 8 5 Precautions on Input Output Ports ...
Страница 298: ...9 9 58 Rev 1 0 This is a blank page DMAC 9 4 Precautions on Using DMAC ...
Страница 416: ...10 10 118 Rev 1 0 This is a blank page INPUT OUTPUT TIMERS 10 6 TOM Output Related 16 bit Timers ...
Страница 658: ...14 14 16 Rev 1 0 REAL TIME DEBUGGER RTD 14 4 Typical Connection with the Host This is a blank page ...
Страница 718: ...16 16 16 Rev 1 0 This is a blank page D A CONVERTERS 16 3 Functional Description of the D A Converters ...
Страница 766: ...18 18 22 Rev 1 0 WAIT CONTROLLER 18 3 Typical Operation of the Wait Controller This is a blank page ...
Страница 776: ...19 19 10 Rev 1 0 RAM BACKUP MODE 19 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Страница 777: ...CHAPTER 20 CHAPTER 20 OSCILLATION CIRCUIT 20 1 Oscillator Circuit 20 2 Clock Generator Circuit ...
Страница 782: ...20 20 6 Rev 1 0 OSCILLATION CIRCUIT 20 2 Clock Generator Circuit This is a blank page ...
Страница 856: ...23 23 26 Rev 1 0 This is a blank page ELECTRICAL CHARACTERISTICS 23 6 AC Characteristics ...
Страница 857: ...24 1 A D Conversion Characteristics CHAPTER 24 CHAPTER 24 STANDARD CHARACTERISTICS ...
Страница 859: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Страница 861: ...Appendix 2 1 M32R E Instruction Processing Time APPENDIX 2 APPENDIX 2 INSTRUCTION PROCESSING TIME ...
Страница 865: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...