16
16-3
Ver.0.10
WAIT CONTROLLER
16.1 Outline of the Wait Controller
When accessing an extended external area, the wait controller controls the number of wait cycles
to be inserted in bus cycles based on the number of wait cycles set by software and those entered
____
from the WAIT pin.
The number of wait cycles that can controlled in software is 1 to 4. (For external access, bus cycles
with 1 wait cycle are the shortest bus cycle.)
____
When the WAIT pin input is sampled low in the last cycle of internal wait cycles set by software, the
____
____
wait cycle is extended as long as the WAIT signal is held low. Then when the WAIT signal is
released back high, the wait cycle is terminated and the next new bus cycle is entered into.
Table 16.1.2 Number of Wait Cycles that Can be Set by the Wait Controller
Extended
External Area
Address
Number of Wait Cycles Inserted
CS0 area
H'0010 0000 - H'001F FFFF
One to 4 wait cycles set by so any number of
(External extension mode)
____
wait cycles entered from WAIT pin
H'0000 0000 - H'001F FFFF
(However, wait cycles set by software have priority.)
(Processor mode)
CS1 area
H'0020 0000 - H'003F FFFF
One to 4 wait cycles set by so any number of
(External extension mode
____
wait cycles entered from WAIT pin
and processor mode)
(However, wait cycles set by software have priority.)
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 ...