HD64F3028F25 Datasheet, PDF (180/925 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

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 H8/3028 Group can extend the bus cycle by inserting one or
more wait states (T_w). There are two ways of inserting wait states: (1) program wait insertion and
(2) 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. 2.00, 09/03, page 148 of 890