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H8S2245 데이터시트(PDF) 206 Page - Renesas Technology Corp

부품명 H8S2245
상세설명  Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

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Section 6 Bus Controller
Rev.3.00 Mar. 26, 2007 Page 164 of 772
REJ09B0355-0300
6.5.5
Wait Control
When accessing external space, the H8S/2245 Group can extend the bus cycle by inserting one or
more wait states (T
w). There are two ways of inserting wait states: (1) program wait insertion and
(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
2 state and T3 state on an
individual area basis in 3-state access space, according to the settings of WCRH and WCRL.
(2) Pin Wait Insertion Using
WAIT
WAIT
WAIT
WAIT Pin
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 φ in the last T
2 or Tw state, a Tw state is inserted. If the
WAIT pin is held low, T
w states are inserted until it goes high.
This is useful when inserting four or more T
w states, or when changing the number of Tw states for
different external devices.
The WAITE bit setting applies to all areas.



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