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HD6432351 Datasheet(PDF) 193 Page - Renesas Technology Corp

Part # HD6432351
Description  16-Bit Single-Chip Microcomputer
PDF  1025 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6432351 Datasheet(HTML) 193 Page - Renesas Technology Corp

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Section 6 Bus Controller
Rev. 3.00 Sep 15, 2006 page 159 of 988
REJ09B0330-0300
6.4.5
Wait Control
When accessing external space, the H8S/2350 Group can extend the bus cycle by inserting one or
more wait states (Tw). There are two ways of inserting wait states: program wait insertion and pin
wait insertion using the
WAIT pin.
• Program Wait Insertion
From 0 to 3 wait states can be inserted automatically between the T2 state and T3 state on an
individual area basis in 3-state access space, according to the settings of WCRH and WCRL.
• Pin Wait Insertion
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 T2 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 Tw 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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