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TDA8007BHL Fiches technique(PDF) 7 Page - NXP Semiconductors

No de pièce TDA8007BHL
Description  Double multiprotocol IC card interface
Download  36 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA8007BHL Fiches technique(HTML) 7 Page - NXP Semiconductors

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2000 Nov 09
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Philips Semiconductors
Product specification
Double multiprotocol IC card interface
TDA8007B
FUNCTIONAL DESCRIPTION
Throughout this specification, it is assumed that the reader
is aware of ISO 7816 norm terminology.
Interface control
The TDA8007B can be controlled via an 8-bit parallel bus
(bits D0 to D7).
If a microcontroller with a multiplexed address/data bus
(such as the 80C51) is used, then D0 to D7 may be directly
connected to P0 to P7. When CS is LOW, the
demultiplexing of address and data is performed internally
using the ALE signal, a LOW pulse on pin RD allows the
selected register to be read, a LOW pulse on pin WR
allows the selected register to be written to. The
TDA8007B automatically switches to the multiplexed bus
configuration if a rising edge is detected on pin ALE. In this
event, AD0 to AD3 play no role and may be tied to VDD or
GND. Using a 80C51 microcontroller, the TDA8007B is
simply controlled with MOVX instructions.
If ALE is tied to VDD or GND, then the TDA8007B will be in
the non-multiplexed configuration. In this case, the
address bits are external pins AD0 to AD3, RD is the
read/write control signal, and WR is a data write or read
active LOW enable signal.
In both configurations, the TDA8007B is selected only
when CS is LOW. INT is an active LOW interrupt signal.
In non-multiplexed bus configuration, CS and EN play the
same role.
In read operations (RD/WR is HIGH), the data
corresponding to the chosen address is available on the
bus when both CS and EN are LOW.
In write operations, the data present on the bus is written
when signals RD/WR, CS and EN become LOW.
handbook, full pagewidth
LATCH
MUX
MUX
addresses
FCE679
RD
WR
REC
CS
AD0 to AD3
ALE
WR
RD
D0 to D7
REGISTERS
Fig.3 Multiplexed bus recognition.


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