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ST16654 Fiches technique(PDF) 5 Page - Exar Corporation

No de pièce ST16654
Description  QUAD UART WITH 64-BYTE FIFO AND INFRARED (IrDA) ENCODER/DECODER
Download  49 Pages
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Fabricant  EXAR [Exar Corporation]
Site Internet  http://www.exar.com
Logo EXAR - Exar Corporation

ST16654 Fiches technique(HTML) 5 Page - Exar Corporation

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ST16C654/654D
5-69
Rev. 4.10
SYMBOL DESCRIPTION
Symbol
Pin
Signal
Pin Description
68
100
64
type
16/-68
31
36
-
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 16C554
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 inter-
nally 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
39
24
I
Address-0 Select Bit. Internal registers address selection in
16 and 68 modes.
A1
33
38
23
I
Address-1 Select Bit. Internal registers address selection in
16 and 68 modes.
A2
32
37
22
I
Address-2 Select Bit. - Internal registers address selection
in 16 and 68 modes.
A3-A4
20,50
17,64
-
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.
CLKSEL
30
35
-
I
Clock Select. - The 1X or 4X pre-scaleable clock is selected
by this pin. The 1X clock is selected when CLKSEL is a logic
1 (connected to VCC) or the 4X is selected when CLKSEL
is a logic 0 (connected to GND). MCR bit-7 can override the
state of this pin following reset or initialization (see MCR bit-
7). This pin is not available on 64 pin packages which
provide MCR bit-7 selection only.
-CS
16
13
-
I
Chip Select. (active low) - In the 68 mode, this pin functions
as a multiple channel chip enable. In this case, all four


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