SC16C752BIBS,128 NXP Semiconductors, SC16C752BIBS,128 Datasheet - Page 11

• Manufacturer Part Number: SC16C752BIBS,128
• Description: IC DUAL UART 64BYTE 32HVQFN
• Manufacturer: NXP Semiconductors

Specifications of SC16C752BIBS,128

• Features: False-start Bit Detection
• Number Of Channels: 2, DUART
• Fifo's: 64 Byte
• Voltage - Supply: 2.5V, 3.3V, 5V
• With Auto Flow Control: Yes
• With False Start Bit Detection: Yes
• With Modem Control: Yes
• Mounting Type: Surface Mount
• Package / Case: 32-VFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935276389128; SC16C752BIBS-F; SC16C752BIBS-F

NXP Semiconductors
SC16C752B
Product data sheet
6.3.3.1 Assumptions
6.3.3 Software flow control example
UART1 is transmitting a large text file to UART2. Both UARTs are using software flow
control with single character Xoff (0Fh) and Xon (0Dh) tokens. Both have Xoff threshold
(TCR[3:0] = Fh) set to 60, and Xon threshold (TCR[7:4] = 8h) set to 32. Both have the
interrupt receive threshold (TLR[7:4] = Dh) set to 52.
UART 1 begins transmission and sends 52 characters, at which point UART2 will
generate an interrupt to its processor to service the receive FIFO, but assume the
interrupt latency is fairly long. UART1 will continue sending characters until a total of 60
characters have been sent. At this time, UART2 will transmit a 0Fh to UART1, informing
UART1 to halt transmission. UART1 will likely send the 61
sending the Xoff character. Now UART2 is serviced and the processor reads enough data
out of the receive FIFO that the level drops to 32. UART2 will now send a 0Dh to UART1,
informing UART1 to resume transmission.
Fig 7.
Software flow control example
SERIAL-TO-PARALLEL
PARALLEL-TO-SERIAL
All information provided in this document is subject to legal disclaimers.
TRANSMIT FIFO
Xon1 WORD
Xon2 WORD
Xoff1 WORD
Xoff2 WORD
5 V, 2.2 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs
UART1
Rev. 6 — 30 November 2010
Xoff–Xon–Xoff
programmed
characters
compare
Xon-Xoff
data
st
SERIAL-TO-PARALLEL
PARALLEL-TO-SERIAL
character while UART2 is
RECEIVE FIFO
Xon2 WORD
Xon1 WORD
Xoff1 WORD
Xoff2 WORD
SC16C752B
UART2
© NXP B.V. 2010. All rights reserved.
002aaa229
11 of 47