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UM10503
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User manual
Rev. 2.1 — 10 December 2015
1143 of 1441
NXP Semiconductors
UM10503
Chapter 40: LPC43xx/LPC43Sxx USART0_2_3
a. Mode 0 (start bit and LSB are used for auto-baud)
b. Mode 1 (only start bit is used for auto-baud)
Fig 128. Auto-baud a) mode 0 and b) mode 1 waveform
UARTn RX
start bit
LSB of 'A' or 'a'
U0ACR 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
UARTn 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