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參數(shù)資料
| 型號(hào)： | P8242AH |
| 廠商： | INTEL CORP |
| 元件分類(lèi)： | 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, 12.5 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁(yè)數(shù)： | 5/20頁(yè) |
| 文件大小： | 243K |
| 代理商： | P8242AH |
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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.
When EA is enabled on the UPI, the program
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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