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ST16C454IJ68 Scheda tecnica(PDF) 6 Page - Exar Corporation

Il numero della parte ST16C454IJ68
Spiegazioni elettronici  QUAD UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART)
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Produttore elettronici  EXAR [Exar Corporation]
Homepage  http://www.exar.com
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ST16C454/68C454
6
Rev. 3.20
under R/-W.
-IRQ
15
O
Interrupt Request or Interrupt “A” - This function is associated with
the 68 mode only. In the 68 mode, interrupts from UART channels
A-D are WIRE-OR’ed” internally to function as a single IRQ
interrupt. This pin transitions to a logic 0 (if enabled by the interrupt
enable register) whenever a UART channel(s) requires service.
Individual channel interrupt status can be determined by address-
ing each channel through its associated internal register, using -
CS and A3-A4. In the 68 mode an external pull-up resistor must be
connected between this pin and VCC. The function of this pin
changes to INTA when operating in the 16 mode, see definition
under INTA.
-RESET
RESET
37
I
Reset. - In the 16 mode a logic 1 on this pin will reset the internal
registers and all the outputs. The UART transmitter output and the
receiver input will be disabled during reset time. (See ST16C454
External Reset Conditions for initialization details.) When 16/-68
is a logic 0 (68 mode), this pin functions similarly but, as an inverted
reset interface signal, -RESET.
R/-W
18
I
Read/Write Strobe (active low) - This function is associated with
the 68 mode only. This pin provides the combined functions for
Read or Write strobes. A logic 1 to 0 transition transfers the
contents of the CPU data bus (D0-D7) to the register selected by
-CS and A0-A4. Similarly a logic 0 to 1 transition places the
contents of a 454 register selected by -CS and A0-A4 on the data
bus, D0-D7, for transfer to an external CPU.
VCC
13
VCC
47,64
I
Power supply inputs.
XTAL1
35
I
Crystal or External Clock Input - Functions as a crystal input or as
an external clock input. A crystal can be connected between this
pin and XTAL2 to form an internal oscillator circuit (see figure 8).
Alternatively, an external clock can be connected to this pin to
provide custom data rates (see Baud Rate Generator Program-
ming).
XTAL2
36
O
Output of the Crystal Oscillator or Buffered Clock - (See also
XTAL1). Crystal oscillator output or buffered clock output.
Symbol
Pin
Signal
Pin Description
type
SYMBOL DESCRIPTION


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