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| 型號(hào)： | 7643 |
| 英文描述： | IrDA. protocol handler plus endec for DCE Apps, -40C to +85C, 18-SOIC 300mil, TUBE |
| 中文描述： | 7643Group數(shù)據(jù)表數(shù)據(jù)表1369K/JUL.30.03 |
| 文件頁(yè)數(shù)： | 66/120頁(yè) |
| 文件大小： | 1369K |
| 代理商： | 7643 |
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Rev.1.00 Jul 30, 2003 page 66 of 119
7643 Group
Slow Memory Wait
The 7643 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. 64 Software wait timing diagram
X
I
N
φ
O
D
O
D
R
U
T
A
U
T
R
W
C
P
M
B
=
0
0
1
C
P
M
B
=
0
1
1
6
1
-
c
y
c
l
e
s
o
f
t
w
a
r
e
w
a
i
t
N
o
w
a
i
t
C
P
M
B
=
0
2
1
6
2-c
y
c
l
e
s
o
f
t
w
a
r
e
w
a
i
t
C
P
M
B
=
0
3
1
6
3-
c
y
c
l
e
s
o
f
t
w
a
r
e
w
a
i
t
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. 65 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-cycle RDY wait
No wait
2-cycle RDY wait
3-cycle RDY wait
t
su
t
su
t
su
t
su
t
su
Note
: This diagram assumes
φ
= X
IN
/2.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 765-11-(SERIES) | Analog IC |
| 765-11-20K | Analog IC |
| 765-11-25A | Analog IC |
| 765-11E | 8 BIT INPUT/OUTPUT EXPANDER, I2C INTERFACE, -40C to +125C, 20-QFN, TUBE |
| 765-11R | 8-bit I/O Expander with I2C Interface., -40C to +125C, 18-SOIC 300mil, TUBE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 764-3"x36yd-Red | 功能描述:膠帶 764 RED 3X36 YD BULK RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類(lèi)型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds |
| 764-3"x36yd-White | 功能描述:膠帶 WHITE 3X36YD BULK RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類(lèi)型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds |
| 764-3"x36yd-Yellow | 功能描述:膠帶 764 YELLOW 3X36 YD BULK RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類(lèi)型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds |
| 7643_06 | 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER |
| 76430 | 制造商:Brady Corporation 功能描述:TAPE, BARRICADE, BLACK/PHOSPHORESCENT, 2INX5YD; Tape Type:Safety, Hazard Warning; Tape Backing Material:Polyester Film; Tape Width - Metric:50.8mm; Tape Width - Imperial:2"; Tape Length - Metric:4.572m; Tape Length - Imperial:5yard ;RoHS Compliant: NA |
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