Philips LPC2101 - UART1 Transmit Enable Register (U1 TER - 0 Xe001 0030)

© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
User manual Rev. 01 — 12 January 2006 116
Philips Semiconductors
UM10161
Volume 1 Chapter 10: UART1
10.3.17 UART1 Transmit Enable Register (U1TER - 0xE001 0030)
LPC2101/02/03’s U1TER enables implementation of software and hardware flow control.
When TXEn=1, UART1 transmitter will keep sending data as long as they are available.
As soon as TXEn becomes 0, UART1 transmission will stop.
Table 116
describes how to use TXEn bit in order to achieve software flow control.
a. Mode 0 (start bit and LSB are used for auto-baud)
b. Mode 1 (only start bit is used for auto-baud)
Fig 21. Autobaud a) mode 0 and b) mode 1 waveform
UART1 RX
start bit LSB of 'A' or 'a'
U1ACR start
rate counter
start bit0 bit1 bit2 bit3 bit4 bit5 bit6 bit7 parity stop
'A' (0x41) or 'a' (0x61)
16 cycles 16 cycles
16xbaud_rate
UART1 RX
start bit LSB of 'A' or 'a'
rate counter
'A' (0x41) or 'a' (0x61)
start bit0 bit1 bit2 bit3 bit4 bit5 bit6 bit7 parity stop
U1ACR start
16 cycles
16xbaud_rate