M66222FP MITSUBISHI [Mitsubishi Electric Semiconductor], M66222FP Datasheet - Page 7

• Manufacturer Part Number: M66222FP
• Description: 128 x 8-BIT x 2 MAIL-BOX
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Write Cycle
Write cycle No.1 (WE control) See Notes 6, 7 and 8.
Write cycle No.2 (CS control) See Notes 7 and 8.
A
CS
OE
WE
I/O
I/O
A
CS
WE
I/O
0
0
(D
~A
~A
0
0
0
~I/O
~I/O
~I/O
(D
OUT
(D
7
7
IN
IN
7
7
)
)
7
)
Notes 6: The WE of the port must be set to “H” when an address input changes.
7: A write operation is performed during the overlap period when both CS and WE are “L”.
8: Do not apply any negative-phase signal from outside when an I/O pin is in output state.
9: The shaded part means a state in which a signal can be “H” or “L”.
t
su(A)1
t
su(A)2
t
su(A-WEH)
t
dis(OE)
t
dis(WE)
t
su(CS)
t
w(WE)
t
t
CW
CW
Data input determined
t
Data input determined
su(CS)
t
su(D)
t
su(D)
t
en(WE)
t
rec(WE)
t
t
h(D)
t
rec(WE)
h(D)
t
en(OE)
MITSUBISHI DIGITAL ASSP
128
M66222SP/FP
8-BIT
2 MAIL-BOX
7