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| HD64F3048F16 Datasheet, PDF (173/903 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents | |||
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Section 6 Bus Controller
6.3.5 Wait Modes
Four wait modes can be selected as shown in table 6.5.
Table 6.5 Wait Mode Selection
ASTCR
ASTn Bit
0
1
WCER
WCEn Bit
â
0
1
Note: n = 7 to 0
WCR
WMS1 Bit WMS0 Bit WSC Control
â
â
Disabled
â
â
Disabled
0
0
Enabled
1
Enabled
1
0
Enabled
1
Enabled
Wait Mode
No wait states
Pin wait mode 0
Programmable wait mode
No wait states
Pin wait mode 1
Pin auto-wait mode
Wait Mode in Areas Where Wait-State Controller is Disabled
External three-state access areas in which the wait-state controller is disabled (ASTn = 1, WCEn =
0) operate in pin wait mode 0. The other wait modes are unavailable. The settings of bits WMS1
and WMS0 are ignored in these areas.
Pin Wait Mode 0: Wait states can only be inserted by WAIT pin control. During access to an
external three-state-access area, if the WAIT pin is low at the fall of the system clock (Ï) in the T2
state, a wait state (TW) is inserted. If the WAIT pin remains low, wait states continue to be inserted
until the WAIT signal goes high. Figure 6.12 shows the timing.
Rev. 3.00 Sep 27, 2006 page 145 of 872
REJ09B0325-0300
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