Rev. 1.0, 09/01, page 152 of 904
Program Wait Insertion: From 0 to 7 wait states can be inserted automatically between the T
2
state and T
3
state on an individual area basis in 3-state access space, according to the settings in
WTCRA and WTCRB.
Pin Wait Insertion: Setting the WAITE bit to 1 in BCR enables wait input by means of the
:$,7
pin. When external space is accessed in this state, a program wait is first inserted in
accordance with the settings in WTCRA and WTCRB. If the
:$,7
pin is low at the falling edge
of ø in the last T
2
or T
w
state, another T
w
state is inserted. If the
:$,7
pin is held low, T
w
states are
inserted until it goes high. This is useful when inserting seven or more T
w
states, or when changing
the number of T
w
states to be inserted for different external devices. The WAITE bit setting
applies to all areas. Figure 6.18 shows an example of wait state insertion timing.
The settings after a reset are: 3-state access, insertion of 7 program wait states, and
:$,7
input
disabled.
Содержание H8S/2376 F-ZTAT
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