SC16C852LIBS,151 NXP Semiconductors, SC16C852LIBS,151 Datasheet - Page 17

• Manufacturer Part Number: SC16C852LIBS,151
• Description: IC UART DUAL W/FIFO 32-HVQFN
• Manufacturer: NXP Semiconductors
• Type: IrDA or RS- 485r

Specifications of SC16C852LIBS,151

• Number Of Channels: 2, DUART
• Package / Case: 32-VFQFN Exposed Pad
• Features: Programmable
• Fifo's: 128 Byte
• Protocol: RS485
• Voltage - Supply: 1.8V
• With Auto Flow Control: Yes
• With Irda Encoder/decoder: Yes
• With False Start Bit Detection: Yes
• With Modem Control: Yes
• With Cmos: Yes
• Mounting Type: Surface Mount
• Data Rate: 5 Mbps
• Supply Voltage (max): 1.95 V
• Supply Voltage (min): 1.65 V
• Supply Current: 5 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 1.8 V
• Transmitter And Receiver Fifo Counter: Yes
• Mounting: Surface Mount
• Pin Count: 32
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 568-4209; 935283101151; SC16C852LIBS-S

NXP Semiconductors
SC16C852L
Product data sheet
6.9 Programmable baud rate generator
The SC16C852L UART contains a programmable rational baud rate generator that takes
any clock input and divides it by a divisor in the range between 1 and (2
SC16C852L offers the capability of dividing the input frequency by rational divisor. The
fractional part of the divisor is controlled by the CLKPRES register in the ‘first extra feature
register set’.
where:
Prescaler = 1 when MCR[7] is set to 0.
Prescaler = 4 when MCR[7] is set to 1.
A single baud rate generator is provided for the transmitter and receiver. The
programmable Baud Rate Generator is capable of operating with a frequency of up to
80 MHz. To obtain maximum data rate, it is necessary to use full rail swing on the clock
input. The SC16C852L can be configured for internal or external clock operation. For
internal clock operation, an industry standard crystal is connected externally between the
XTAL1 and XTAL2 pins (see
to the XTAL1 pin (see
custom rates (see
The generator divides the input 16 clock by any divisor from 1 to (2
SC16C852L divides the basic external clock by 16. The baud rate is configured via the
CLKPRES, DLL and DLM internal register functions. Customized baud rates can be
achieved by selecting the proper divisor values for the MSB and LSB sections of the baud
rate generator.
Programming the baud rate generator registers CLKPRES, DLM (MSB) and DLL (LSB)
provides a user capability for selecting the desired final baud rate. The example in
shows the selectable baud rate table available when using a 1.8432 MHz external clock
input when MCR[7] = 0, and CLKPRES = 0x00.
baud rate
Fig 7.
N is the integer part of the divisor in DLL and DLM registers;
M is the fractional part of the divisor in CLKPRES register;
f
XTAL1
XTAL1
XTAL2
is the clock frequency at XTAL1 pin.
Prescalers and baud rate generator block diagram
=
OSCILLATOR
------------------------------------------------------------------ -
MCR 7  
All information provided in this document is subject to legal disclaimers.
Table
1.8 V dual UART with 128-byte FIFOs and IrDA encoder/decoder

Figure
Rev. 4 — 1 February 2011
f
XTAL1
7).
16

DIVIDE-BY-1
DIVIDE-BY-4
Figure
9) to clock the internal baud rate generator for standard or


N
+
----- -
16
M
8). Alternatively, an external clock can be connected


MCR[7] = 0
MCR[7] = 1
GENERATOR
BAUD RATE
(DLL, DLM)
CLKPRES
[3:0]
SC16C852L
16
 1). The
© NXP B.V. 2011. All rights reserved.
16
 1). The
transmitter and
receiver clock
002aac645
Table 7
17 of 64
(1)