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Microcomputer Technical Q&A
38
Q&A No.: QAH8S-033
Category: Bus Controller
Subject: WAIT (1)
Question
When programmable waits are inserted and the pin wait function is also used, by what point
should the WAIT pin level be settled?
Answer
The WAIT pin level should be settled by the fall of
φ
in the last T2 or Tw state.
Program waits Pin waits
φ
WAIT
T1
T2
Tw Tw Tw Tw Tw Tw
T3
Wait State Insertion Timing
Applicable Products
Applicability Series Applicability Series Applicability Series
Yes Entire H8S Series H8S/2655 H8S/2350
H8S/2355 H8S/2357 H8S/2345
H8S/2245 H8S/2148 H8S/2144
H8S/2138 H8S/2134 H8S/2128
H8S/2124 — — — —