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AM85C30-16BUA Folha de dados(PDF) 8 Page - Advanced Micro Devices

Nome de Peças AM85C30-16BUA
Descrição Electrónicos  Enhanced Serial Communications Controller
Download  68 Pages
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Fabricante Electrônico  AMD [Advanced Micro Devices]
Página de início  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM85C30-16BUA Folha de dados(HTML) 8 Page - Advanced Micro Devices

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AMD
8
Am85C30
W/REQA, W/REQB
Wait/Request (Outputs; Open drain when pro-
grammed for a Wait function, driven High or Low
when programmed for a Request function)
These dual-purpose outputs may be programmed as
Request lines for a DMA controller or as Wait lines to
synchronize the CPU to the SCC data rate. The reset
state is Wait.
Control
A/B
Channel A/Channel B Select (Input)
This signal selects the channel in which the Read or
Write operation occurs.
CE
Chip Enable (Input; Active Low)
This signal selects the SCC for a Read or Write
operation.
D/C
Data/Control Select (Input)
This signal defines the type of information transferred to
or from the SCC. A High means data is transferred; a
Low indicates a command is transferred.
Data Bus
D7–D0
Data Bus (Input/Output; Three State)
These lines carry data and commands to and from the
SCC.
Interrupt
IEI
Interrupt Enable In (Input; Active High)
IEI is used with IEO to form an interrupt daisy chain
when there is more than one interrupt-driven device. A
High IEI indicates that no other higher priority device has
an interrupt under service or is requesting an interrupt.
IEO
Interrupt Enable Out (Output; Active High)
IEO is High only if IEI is High and the CPU is not servic-
ing an SCC interrupt or the SCC is not requesting an
interrupt (interrupt acknowledge cycle only). IEO is con-
nected to the next lower priority device’s IEI input and
thus inhibits interrupts from lower priority devices.
INT
Interrupt Request (Output; Active Low,
Open Drain)
This signal is activated when the SCC requests an
interrupt.
INTACK
Interrupt Acknowledge (Input; Active Low)
This signal indicates an active interrupt acknowledge
cycle. During this cycle, the SCC interrupt daisy chain
settles. When
RD becomes active, the SCC places an
interrupt vector on the data bus (if IEI is High).
INTACK
is latched by the rising edge of PCLK.
Serial Data
RxDA, RxDB
Receive Data (Inputs; Active High)
These input signals receive serial data at standard TTL
levels.
TxDA, TxDB
Transmit Data (Outputs; Active High)
These output signals transmit serial data at standard
TTL levels.
Miscellaneous
GND
Ground
PCLK
Clock (Input)
This is the master SCC clock used to synchronize inter-
nal signals. PCLK is not required to have any phase
relationship with the master system clock. PCLK is a
TTL- level signal. Maximum transmit rate is 1/4 PCLK.
VCC
+ 5 V Power Supply


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