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ST16C554DCJ68 データシート(PDF) 5 Page - Exar Corporation

部品番号 ST16C554DCJ68
部品情報  QUAD UART WITH 16-BYTE FIFOS
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メーカー  EXAR [Exar Corporation]
ホームページ  http://www.exar.com
Logo EXAR - Exar Corporation

ST16C554DCJ68 データシート(HTML) 5 Page - Exar Corporation

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ST16C554/554D/68C554
5
Rev. 3.10
SYMBOL DESCRIPTION
Symbol
Pin
Signal
Pin Description
68
64
type
16/-68
31
-
I
16/68 Interface Type Select (input with internal pull-up). -
This input provides the 16 (Intel) or 68 (Motorola) bus
interface type select. The functions of -IOR, -IOW, INT A-
D, and -CS A-D are re-assigned with the logical state of this
pin. When this pin is a logic 1, the 16 mode interface
16C554D is selected. When this pin is a logic 0, the 68 mode
interface (68C554) is selected. When this pin is a logic 0, -
IOW is re-assigned to -R/W, RESET is re-assigned to -
RESET, -IOR is not used, and INT A-D(s) are connected in
a WIRE-OR” configuration. The WIRE-OR outputs are
connected internally to the open source IRQ signal output.
This pin is not available on 64 pin packages which operate
in the 16 mode only.
A0
34
24
I
Address-0 Select Bit. Internal registers address selection in
16 and 68 modes.
A1
33
23
I
Address-1 Select Bit. Internal registers address selection in
16 and 68 modes.
A2
32
22
I
Address-2 Select Bit. - Internal registers address selection
in 16 and 68 modes.
A3-A4
20,50
-
I
Address 3-4 Select Bits. - When the 68 mode is selected,
these pins are used to address or select individual UART’s
(providing -CS is a logic 0). In the 16 mode, these pins are
reassigned as chip selects, see -CSB and -CSC. These pins
are not available on 64 pin packages which operate in the
16 mode only.
-CS
16
-
I
Chip Select. (active low) - In the 68 mode, this pin functions
as a multiple channel chip enable. In this case, all four
UARTs (A-D) are enabled when the -CS pin is a logic 0. An
individual UART channel is selected by the data contents of
address bits A3-A4. When the 16 mode is selected (68 pin
device), this pin functions as -CSA, see definition under -CS
A-B. This pin is not available on 64 pin packages which
operate in the 16 mode only.


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