參數(shù)資料
型號(hào)： CDP1851
廠商： Intersil Corporation
英文描述： CMOS Programmable I/O Interface(CMOS 可編程I/O接口)
中文描述： CMOS可編程I / O接口的CMOS（可編程的I / O接口）
文件頁(yè)數(shù)： 8/14頁(yè)
文件大?。?/td> 56K
代理商： CDP1851
4-12
Function Pin Definition
CLOCK (Input):
Positive input pulse that latches READ and CS on its trailing
edge.
CS - CHIP SELECT (Input)
A high-level voltage at this input selects the CDP1851 PlO.
RA0 - REGISTER ADDRESS 0 (Input):
This input and RA1 are used to select either the ports or the
control/status registers.
RA1 - REGISTER ADDRESS 1(Input):
See RAO
BUS 0 - BUS 7:
Bidirectional CPU data bus.
CLEAR (Input)
A low-level voltage at this input resets both ports to the input
mode, and also resets the status register, A RDY, B RDY,
and interrupt enable (disabling interrupts).
A INT - A INTERRUPT (Output):
A low-level voltage at this output indicates the presence of
one of the interrupt conditions listed in Table 3. This output is
an open-drain NMOS device (to allow wired O Ring) and
must be tied to a pullup resistor, normally 10k
.
B INT - B INTERRUPT (Output):
A low-level voltage at this output indicates the presence of
one of the interrupt conditions listed in Table 3. This output is
also an open-drain NMOS device and must be tied to a
pullup resistor.
B RDY - B READY (Output):
This output is a handshaking or data bit I/O line in the bit-
programmable mode.
B STROBE (Input):
An input handshaking line for port B in the input and output
modes, and for port A when it is in the bidirectional mode. It
can be used as a data bit I/O line in the bit-programmable
mode except when port A is not programmed as bidirectional.
B0 - B7:
Data input or output lines for port B.
V
SS
Ground
A0 - A7:
Data input or output lines for port A.
A STROBE (Input):
An input handshaking line for port A in the input, output, and
bidirectional modes. It can also be used as a data bit I/O line
when port A is in the bit-programmable mode.
ARDY - AREADY (Output):
A output handshaking line or data bit I/O line.
TPB (Input):
A positive input pulse used as a data load, set, or reset
strobe.
WR/RE - WRITE/READ ENABLE (Input):
A positive input used to write data from the CDP1851 to the
CPU bus.
RD/WE - READ/WRITE ENABLE (Input):
A positive input used to read data from the CPU bus to the
CDP1851 bus.
V
DD
:
Positive supply voltage.
CDP1851, CDP1851C
相關(guān)PDF資料
PDF描述
CDP1851CD CMOS Programmable I/O Interface
CDP1851CDX CMOS Programmable I/O Interface
CDP1851CE CMOS Programmable I/O Interface
CDP1851CEX CMOS Programmable I/O Interface
CDP1851DX CMOS Programmable I/O Interface
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CDP1851 DIE 制造商:Harris Corporation 功能描述:
CDP1851 WAF 制造商:Harris Corporation 功能描述:
CDP1851C 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS Programmable I/O Interface
CDP1851CD 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS Programmable I/O Interface
CDP1851CDX 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS Programmable I/O Interface
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