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H8/3021 Folha de dados(PDF) 146 Page - Renesas Technology Corp

Nome de Peças H8/3021
Descrição Electrónicos  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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Fabricante Electrônico  RENESAS [Renesas Technology Corp]
Página de início  http://www.renesas.com
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H8/3021 Folha de dados(HTML) 146 Page - Renesas Technology Corp

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6. Bus Controller
Rev.2.00 Mar. 22, 2007 Page 122 of 684
REJ09B0352-0200
Pin Auto-Wait Mode: If the
WAIT pin is low, the number of wait states (T
W) selected by bits
WC1 and WC0 are inserted.
In pin auto-wait mode, if the
WAIT pin is low at the fall of the system clock (φ) in the T
2 state, the
number of wait states (T
W) selected by bits WC1 and WC0 are inserted. No additional wait states
are inserted even if the
WAIT pin remains low.
Figure 6.7 shows the timing when the wait count is 1.
φ
Address bus
Data bus
AS
RD
WR
Data bus
T1
T2
T3
T1
T2
TW
T3
*
*
Read data
Read data
Write data
Write data
Read
access
Write
access
Note: * Arrows indicate time of sampling of the
WAIT pin.
External address
External address
WAIT pin
Figure 6.7 Pin Auto-Wait Mode



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