參數(shù)資料
型號： M37641M8-XXXHP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述： 單芯片8位CMOS微機(jī)
文件頁數(shù)： 76/149頁
文件大?。?/td> 1997K
代理商： M37641M8-XXXHP
76
7641 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PRELIMINARY
Notice: This is not a final specification.
change.
Some parametric limits are subject to
Slow Memory Wait
The 7641 Group is equipped with the slow memory wait function
(Software wait, RDY wait, and Extended RDY wait: software wait
plus RDY input anytime wait) for easier interfacing with external
devices that have long access times. The slow memory wait func-
tion can be enabled in the memory expansion mode and
microprocessor mode. The appropriate wait mode is selected by
setting bits 0 to 3 of CPU mode register B (address 0001
16
). This
function can extend the read cycle or write cycle only for access to
an external memory. However, this wait function cannot be en-
abled for access to addresses 0008
16
to 000F
16
.
(1) Software wait
The software wait is selected by setting
“
00
”
to the Slow Memory
Wait Mode Select Bits of CPU mode register B (address 0001
16
).
Read/write cycles (
“
L
”
width of RD pin/WR pin) can be extended
by one to three
φ
cycles. The number of cycles to be extended can
be selected with the Slow Memory Wait Select Bits. When the
software wait function is selected, the RDY pin status becomes in-
valid.
(2) RDY wait
RDY Wait is selected by setting
“
10
”
to the Slow Memory Wait
Mode Select Bits of CPU mode register B (address 0001
16
). When
a fixed time of
“
L
”
is input to the RDY pin at the beginning of a
read/write cycle (before
φ
cycle falls), the MCU goes to the RDY
state. The read/write cycle can then be extended by one to three
φ
cycles. The number of
φ
cycles to be added can be selected by
the Slow Memory Wait Bits.
(3) Software wait + Extended RDY wait
Extended RDY Wait is selected by setting
“
11
”
to the Slow
Memory Wait Mode Select Bits of CPU mode register B (address
0001
16
). The read/write cycle can be extended when a fixed time
of
“
L
”
is input to the RDY pin at the beginning of a read/write cycle
(before
φ
cycle falls). The RDY pin state is checked continually at
each fall of
φ
cycle until the RDY pin goes to
“
H
”
. When
“
H
”
is in-
put to the RDY pin, the wait is released within 1, 2, or 3
φ
cycles
(as selected with the Slow Memory Wait Bits).
Fig. 72 Software wait timing diagram
X
IN
φ
O
D
O
U
T
A
U
T
RD
W
R
C
P
M
B
=
0
0
1
6
C
P
M
B
=
0
1
1
6
1-cycle software wait
No wait
CPMB = 02
16
2-cycle software wait
C
P
M
B
=
0
3
1
6
3-cycle software wait
N
o
t
e
:
T
h
i
s
d
i
a
g
r
a
m
a
s
s
u
m
e
s
φ
=
X
I
N
/
2
.
Fig. 73 RDY wait timing diagram
X
IN
φ
OUT
AD
OUT
RD
WR
CPMB = 08
16
CPMB = 09
16
CPMB = 0A
16
CPMB = 0B
16
RDY
t
su
1-time RDY wait
No wait
2-time RDY wait
3-time RDY wait
t
su
t
su
t
su
t
su
t
su
Note
: This diagram assumes
φ
= X
IN
/2.
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