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參數(shù)資料
| 型號： | P8042AH |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | UNIVERSAL PERIPHERAL INTERFACE 8-BIT SLAVE MICROCONTROLLER |
| 中文描述： | 8-BIT, MROM, 0.833 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 243K |
| 代理商： | P8042AH |
UPI-41AH/42AH
5.
P
26
and P
27
are port pins or DMA handshake pins
for use with a DMA controller. These pins default
to port pins on Reset.
If the ‘‘EN DMA’’ instruction has been executed,
P
26
becomes the DRQ (DMA Request) pin. A ‘‘1’’
written to P
26
causes a DMA request (DRQ is acti-
vated).
DRQ
is
deactivated
DACK
#
WR, or execution of the ‘‘EN DMA’’ in-
struction.
by
DACK
#
RD,
If ‘‘EN DMA’’ has been executed, P
27
becomes
the DACK (DMA ACKnowledge) pin. This pin acts
as a chip select input for the Data Bus Buffer reg-
isters during DMA transfers.
210393–7
DMA Handshake Capability
EN DMA
Op Code: 0E5H
1
1
1
0
0
1
0
1
D
7
D
0
6.
counter is placed on Port 1 and the lower three
bits of Port 2 (MSB
e
P
22
, LSB
e
P
10
). On the
UPI this information is multiplexed with PORT
DATA (see port timing diagrams at end of this
data sheet).
7.
The 8741AH and 8742AH support the inteligent
Programming Algorithm. (See the Programming
Section.)
210393–8
Figure 5. 8088-UPI-41AH/42AH Interface
210393–10
Figure 6. 8048H-UPI-41/42 Interface
210393–9
Figure 7. UPI-41/42-8243 Keyboard Scanner
APPLICATIONS
210393–30
Figure 4. UPI-41AH/42AH Keyboard Controller
5
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相關(guān)代理商/技術(shù)參數(shù) |
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| P8042AH/2003 | 制造商:Intel 功能描述:8042AH/2003 |
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| P8044AH/R0117 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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