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SC16C754BIBM-S Datasheet

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Philips Semiconductors
SC16C754
Quad UART with 64-byte FIFO
6.8 Break and time-out conditions
An RX idle condition is detected when the receiver line, RX, has been HIGH for
4 character time. The receiver line is sampled midway through each bit.
When a break condition occurs, the TX line is pulled LOW. A break condition is
activated by setting LCR[6].
6.9 Programmable baud rate generator
The SC16C754 UART contains a programmable baud generator that takes any clock
input and divides it by a divisor in the range between 1 and (2
16
鈭?/div>
1). An additional
divide-by-4 prescaler is also available and can be selected by MCR[7], as shown in
Figure 12.
The output frequency of the baud rate generator is 16脳 the baud rate. The
formula for the divisor is:
铮?/div>
XTAL1 crystal input frequency
铮?/div>
铮?/div>
---------------------------------------------------------------------------
铮?/div>
prescaler
divisor =
--------------------------------------------------------------------------------
-
(
desired baud rate
脳
16
)
Where:
prescaler = 1, when MCR[7] is set to 0 after reset (divide-by-1 clock selected)
prescaler = 4, when MCR[7] is set to 1 after reset (divide-by-4 clock selected).
Remark:
The default value of prescaler after reset is divide-by-1.
Figure 12
shows the internal prescaler and baud rate generator circuitry.
PRESCALER
LOGIC
(DIVIDE-BY-1)
XTAL1
INTERNAL
OSCILLATOR
LOGIC
MCR[7] = 0
INTERNAL
BAUD RATE
CLOCK FOR
TRANSMITTER
AND
RECEIVER
INPUT CLOCK
REFERENCE
CLOCK
MCR[7] = 1
XTAL2
BAUD RATE
GENERATOR
LOGIC
PRESCALER
LOGIC
(DIVIDE-BY-4)
002aaa233
Fig 12. Prescaler and baud rate generator block diagram.
DLL and DLH must be written to in order to program the baud rate. DLL and DLH are
the least signi铿乧ant and most signi铿乧ant byte of the baud rate divisor. If DLL and DLH
are both zero, the UART is effectively disabled, as no baud clock will be generated.
Remark:
The programmable baud rate generator is provided to select both the
transmit and receive clock rates.
Table 7
and
Table 8
show the baud rate and divisor correlation for crystal with
frequency 1.8432 MHz and 3.072 MHz, respectively.
Figure 13
shows the crystal clock circuit reference.
9397 750 11618
漏 Koninklijke Philips Electronics N.V. 2003. All rights reserved.
Product data
Rev. 04 鈥?19 June 2003
18 of 49

SC16C754BIBM-S 产品属性

  • NXP

  • UART 接口集成电路

  • 4

  • 5 Mbps

  • 5.5 V

  • 2.25 V

  • 6 mA

  • + 85 C

  • - 40 C

  • LQFP-64

  • Bulk

  • SMD/SMT

  • 2.5 V, 3.3 V, 5 V

  • 250

  • SC16C754BIBM,151

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