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| HD64F3048VTF8 Datasheet, PDF (176/903 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip | |||
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Section 6 Bus Controller
Pin Auto-Wait Mode: If the WAIT pin is low, the number of wait states (TW) 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 (Ï) in the T2 state, the
number of wait states (TW) selected by bits WC1 and WC0 are inserted. No additional wait states
are inserted even if the WAIT pin remains low. Pin auto-wait mode can be used for an easy
interface to low-speed memory, simply by routing the chip select signal to the WAIT pin.
Figure 6.14 shows the timing when the wait count is 1.
T1
T2
T3
T1
T2
TW
T3
Ï
*
*
WAIT
Address bus
External address
External address
AS
Read
access
RD
Data bus
Read data
Read data
Write
access
HWR, LWR
Data bus
Write data
Write data
Note: * Arrows indicate time of sampling of the WAIT pin.
Figure 6.14 Pin Auto-Wait Mode
Rev. 3.00 Sep 27, 2006 page 148 of 872
REJ09B0325-0300
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