15
15-5
Ver.0.10
EXTERNAL BUS INTERFACE
15.1 External Bus Interface Related Signals
(11) Bus Mode Control Register (BUSMODC)
The 32170 contains a function to switch between two external bus modes.
■
Bus Mode Control Register (BUSMODC)
<Address: H'0080 077F>
D8
9
10
11
12
13
14
D15
BUSMOD
<When reset : H'00>
D
Bit Name
Function
R
W
8 - 15
No functions assigned
0
—
15
BUSMOD
0: WR signal separate mode
(Bus mode control)
1: Byte enable separate mode
This register is used to facilitate memory connection in processor mode and external extension
mode.
When Bus Mode Control Register (BUSMOD) = 0, the WR signal is output separately for each byte
__
___
___
____
____
area. Signals RD, BHW, BLW, BCLK, and WAIT can be used. For memory connection in boot
mode, the Bus Mode Control Register has no effect and the interface operates under conditions
where Bus Mode Control Register (BUSMOD) = 0.
When Bus Mode Control Register (BUSMOD) = 1, the byte enable signal is output separately for
__
___
___
__
____
each byte area. Signals RD, BHW, BLE, WR, and WAIT can be used. For WAIT control circuit
configuration, because BCLK is not output, external timing control is required.
Figure 15.1.1 Pin Function when Bus Modes are Changed
CS0, CS1
DB0 - DB15
WAIT
RD
BHW
BLW
A11 - A30
CS0, CS1
DB0 - DB15
WAIT
RD
WR
BHE
BLE
A11 - A30
BCLK
BUSMOD = 0
BUSMOD = 1
Summary of Contents for M32170F3VFP
Page 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Page 56: ...2 2 14 Ver 0 10 This is a blank page ...
Page 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Page 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Page 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Page 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Page 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Page 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Page 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Page 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...