HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 206
HD6412240
Manufacturer Part Number
HD6412240
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412240.pdf
(818 pages)
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Section 6 Bus Controller
6.5.5
When accessing external space, the H8S/2245 Group can extend the bus cycle by inserting one or
more wait states (T
(2) pin wait insertion using the WAIT pin.
(1) Program Wait Insertion
From 0 to 3 wait states can be inserted automatically between the T
individual area basis in 3-state access space, according to the settings of WCRH and WCRL.
(2) Pin Wait Insertion Using WAIT
Setting the WAITE bit in BCRL to 1 enables wait insertion by means of the WAIT pin. Program
wait insertion is first carried out according to the settings in WCRH and WCRL. Then, if the
WAIT pin is low at the falling edge of in the last T
WAIT pin is held low, T
This is useful when inserting four or more T
different external devices.
The WAITE bit setting applies to all areas.
Rev.3.00 Mar. 26, 2007 Page 164 of 772
REJ09B0355-0300
Wait Control
w
). There are two ways of inserting wait states: (1) program wait insertion and
w
states are inserted until it goes high.
WAIT
WAIT
WAIT Pin
w
states, or when changing the number of T
2
or T
w
state, a T
2
state and T
w
state is inserted. If the
3
state on an
w
states for
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