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TP3465 データシート(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 TP3465
部品情報  TP3465 MICROWIRETM Interface Device (MID)
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

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MultiplexedMicroprocessorBus Interface
The MULT INT pin is sampled on power-up and if LOW the microprocessor bus format is assumed to be Multiplexed and the
pin is considered an input pin to indicate Multiplexed bus format The pin has an internal pull-up and thus if pin is left floating it
will be considered as in Non-multiplexed mode The interface consists of an eight bit multiplexed AddressData microprocessor
bus (only the A0 A1 A2 and A3 address lines are decoded) and six control lines (CE RST ASMI RD DS WR (RW) and the
MULT input) which should be tied LOW
Name
Pin No.
Type
Function
28 Pkg.
AD0 - AD7
1, 2, 3, 4,
I/O
Address/Data bus. Transfers addresses and data
5 7 8 10
between the microprocessor and the MID
CE
19
I
Chip Enable. A LOW on this signal selects the MID for a
ReadWrite operation
WR/
11
I
Write or Read-Write direction. This signal indicates a Write
RW
operation or ReadWrite direction signal
RD/DS
12
I
Read or Data Strobe. With an Intel mP this signal indicates
a Read operation (active low polarity signal) or with a
Motorola mP a Data strobe (active high polarity signal)
AS/MI
21
I
Address Latch Enable or Address Strobe. A HIGH on this
line indicates an address on the external A D bus When
MULT e 1 (non-multiplexed bus) the pin indicates the
type of bus MI e 1 for NSCIntel format and MI e 0 for
Motorola format
RST
22
I
The RST is the master Reset input when LOW forces the
device in the RESET condition (same as Power-on-
Reset)
MULT/
18
I
Multiplexed Bus input or INTerrupt output. It is internally
INT
pulled HIGH to indicate a Non-Multiplexed bus format and
needs to be pulled LOW externally to indicate the
Multiplexed bus format
Non-Multiplexed Microprocessor Interface
The MULT INT pin is sampled on power-up and if not LOW the microprocessor bus format is assumed to be Non-multiplexed
This interface consists of a four-bit Address bus an eight-bit Data bus and six control lines (CE RST ASMI RD DS
WR (RWR) and the INT signal if enabled)
Name
Pin No
Type
Function
28 Pkg
A0 – A3
6 9
I
Address bus These 4 pins (accessible in the 28-pin package)
20 23
are used to address the 16 registers
D0 – D7
1 2 3 4
IO
Data bus for data transfer between the microprocessor and the
5 7 8 10
MID
CE
19
I
Chip Enable A LOW on this signal selects the MID for a
ReadWrite operation
WR
11
I
Write or Read-Write direction This signal indicates a Write
(RW)
operation or ReadWrite direction signal
RD DS
12
I
Read or Data Strobe With an Intel mP this signal indicates a
Read operation (active low polarity signal) or with a Motorola mP
a Data Strobe (active high polarity signal)
ASMI
21
I
Address Latch Enable or Address Strobe A HIGH on this line
indicates an address on the external A D bus When MULTe1
(non-multiplexed bus) the pin indicates the type of bus MIe1
for NSCIntel format and MIe0 for Motorola format
3


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