HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 177

• Manufacturer Part Number: HD6413008F
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Pin Wait Insertion: Setting the WAITE bit in BCR to 1 enables wait insertion by means of the
WAIT pin. When external space is accessed in this state, a program wait is first inserted. If the
WAIT pin is low at the falling edge of φ in the last T
the WAIT pin is held low, T
This is useful when inserting four or more T
different external devices.
The WAITE bit setting applies to all areas.
Figure 6.17 shows an example of the timing for insertion of one program wait state in 3-state
space.
Read access
Write access
Figure 6.17 Example of Wait State Insertion Timing
Address bus
Note:
HWR, LWR
W
Data bus
Data bus
states are inserted until it goes high.
WAIT
φ
indicates the timing of WAIT pin sampling.
RD
AS
T
W
1
states, or when changing the number of T
Inserted
by program wait Inserted by WAIT pin
T
2
2
or T
Rev.4.00 Aug. 20, 2007 Page 133 of 638
T
W
w
state, another T
Write data
T
w
T
w
Read data
W
state is inserted. If
T
REJ09B0395-0400
3
6. Bus Controller
W
states for