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18
WAIT CONTROLLER
18-3
32185/32186 Group Hardware Manual
Rev.1.10 REJ09B0235-0110 May 15, 07
18.1 Outline of Wait Controller
When accessing the external extension area, the Wait Controller controls the number of wait states inserted in
bus cycles based on the number of wait states set by software and the input signal entered from the WAIT# pin.
The number of wait states that can be controlled in software is 0 to 15.
When the input signal on the WAIT# pin is sampled "L" in the last cycle of internal wait state, the wait state is
extended as long as the WAIT# input signal is held "L." Then when the WAIT# input signal is released back
"H," the wait state is terminated and the next new bus cycle is entered into.
Table 18.1.2 Number of Wait States that Can Be Set by the Wait Controller
External extension Area
Address
Number of Wait States Inserted
CS0 area
H’0010 0000 to H’007F FFFF
Zero to 15 wait states set by software
(external extension mode)
+any number of wait states entered from the WAIT# pin
H’0000 0000 to H’007F FFFF
(However, software settings have priority.)
(processor mode)
CS1 area
H’0100 0000 to H’017F FFFF
Zero to 15 wait states set by software
(external extension and
+any number of wait states entered from the WAIT# pin
(Note 1)
processor modes)
(However, software settings have priority.)
CS2 area
H’0200 0000 to H’027F FFFF
Zero to 15 wait states set by software
(external extension and
+any number of wait states entered from the WAIT# pin
(Note 2)
processor modes)
(However, software settings have priority.)
CS3 area
H’0300 0000 to H’037F FFFF
Zero to 15 wait states set by software
(external extension and
+any number of wait states entered from the WAIT# pin
(Note 3)
processor modes)
(However, software settings have priority.)
Note 1: A ghost (8 Mbytes) of the CS1 area will appear in the H'0180 0000 to H'01FF FFFF area.
Note 2: A ghost (8 Mbytes) of the CS2 area will appear in the H'0280 0000 to H'02FF FFFF area.
Note 3: A ghost (8 Mbytes) of the CS3 area will appear in the H'0380 0000 to H'03FF FFFF area.