HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 149
HD6475328-CP10
Manufacturer Part Number
HD6475328-CP10
Description
original Hitachi CMOS microcomputer unit (MCU)
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6475328-CP10.pdf
(459 pages)
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Figure 7-2 shows the timing of the operation in this mode when the wait count is 1 (WC1 = “0,”
WC0 = “1”).
7.3.2 Pin Wait Mode
The pin wait mode is selected when WMS1 = “1” and WMS0 = “0.”
In this mode the WAIT function of the P1
The number of wait states indicated by bits WC1 and WC0 are inserted into any bus cycle in
which the CPU or DTC accesses an off-chip address. In addition, wait states continue to be
inserted as long as the WAIT pin is held low. In particular, if the wait count is 0 but the WAIT pin
is Low at the rising edge of the ø clock in the T
goes High.
This mode is useful for inserting four or more wait states, or when different external devices
require different numbers of wait states.
ø
A
RD, AS,
DS (Read)
D –D
WR, DS
(Write)
D –D
19
7
7
–A
0
0
0
T
2
Read data
state or T
Figure 7-2 Programmable Wait Mode
3
T
4
1
/WAIT pin is used automatically.
2
131
state, wait states are inserted until the WAIT pin
T
Off-chip address
2
Write data
T
W
Read data
T
3
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