NXP Semiconductors LPC11U3x

UM10462 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2016. All rights reserved.
User manual Rev. 5.5 — 21 December 2016 262 of 523
NXP Semiconductors
UM10462
Chapter 12: LPC11U3x/2x/1x USART
Fig 28. Algorithm for setting USART dividers
PCLK,
BR
Calculating UART
baudrate (BR)
DL
est
= PCLK/(16 x BR)
DL
est
is an
integer?
DIVADDVAL = 0
MULVAL = 1
Tr ue
FR
est
= 1.5
DL
est
= Int(PCLK/(16 x BR x FR
est
))
1.1 < FR
est
< 1.9?
Pick another FR
est
from
the range [1.1, 1.9]
FR
est
= PCLK/(16 x BR x DL
est
)
DIVADDVAL = table(FR
est
)
MULVAL = table(FR
est
)
DLM = DL
est
[15:8]
DLL = DL
est
[7:0]
End
False
Tr ue
False