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H8S/2224 Scheda tecnica(PDF) 277 Page - Renesas Technology Corp

Il numero della parte H8S/2224
Spiegazioni elettronici  16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series
PDF  1071 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8S/2224 Scheda tecnica(HTML) 277 Page - Renesas Technology Corp

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Section 7 Bus Controller
Rev. 5.00 Aug 08, 2006 page 191 of 982
REJ09B0054-0500
(2) Pin Wait Insertion
Setting the WAITE bit in BCRH to 1 enables wait insertion by means of the
WAIT pin. When
external space is accessed in this state, 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 T2 or TW state, a TW state is inserted. If the WAIT pin is held low, TW states are inserted
until it goes high.
Figure 7.18 shows an example of wait state insertion timing.
By program
wait
T1
Address bus
φ
AS
RD
Data bus
Read data
Read
HWR, LWR
Write data
Write
Note:
↓ indicates the timing of WAIT pin sampling.
WAIT
Data bus
T2
Tw
Tw
Tw
T3
By
WAIT pin
Figure 7.18 Example of Wait State Insertion Timing



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