HD6413008VF25 Datasheet, PDF (178/688 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

6. Bus Controller
φ
Address bus
CSn
AS
RD
Read access D15 to D8
D7 to D0
HWR
Write access
LWR
D15 to D8
D7 to D0
Bus cycle
T1
T2
External address in area n
Valid
Valid
Valid
Valid
Note: n = 7 to 0
Figure 6.16 Bus Control Signal Timing for 16-Bit, Two-State-Access Area (3)
(Word Access)
6.4.6 Wait Control
When accessing external space, the H8/3008 can extend the bus cycle by inserting wait states (T_w).
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 three-state access space, according to the settings
of WCRH and WCRL.
Rev.4.00 Aug. 20, 2007 Page 132 of 638
REJ09B0395-0400