Datasheet
LPC15XX All information provided in this document is subject to legal disclaimers. © NXP B.V. 2014. All rights reserved.
Product data sheet Rev. 1 — 19 February 2014 75 of 99
NXP Semiconductors
LPC15xx
32-bit ARM Cortex-M3 microcontroller
12.7 USART interface
The maximum USART bit rate is 15 Mbit/s in synchronous mode master mode and
18 Mbit/s in synchronous slave mode.
Remark: USART functions can be assigned to all digital pins. The characteristics are valid
for all digital pins except the open-drain pins PIO0_22 and PIO0_23.
Table 21. USART dynamic characteristics
T
amb
=
40
C to 105
C; 2.4 V <= V
DD
<= 3.6 V; C
L
= 10 pF; input slew = 10 ns. Simulated
parameters sampled at the 50 % level of the falling or rising edge; values guaranteed by design.
Symbol Parameter Min Max Unit
USART master (in synchronous mode)
t
su(D)
data input set-up time 33 - ns
t
h(D)
data input hold time 0 - ns
t
v(Q)
data output valid time - 7 ns
t
h(Q)
data output hold time 2 - ns
USART slave (in synchronous mode)
t
su(D)
data input set-up time 13 - ns
t
h(D)
data input hold time 0 - ns
t
v(Q)
data output valid time - 28 ns
t
h(Q)
data output hold time 12 - ns
In master mode, T
cy(clk)
= U_PCLK/BRGVAL. See the LPC15xx User manual UM10736.
Fig 38. USART timing
8QB6&/.&/.32/
7;'
5;'
7
F\FON
W
VX'
W
K'
W
Y4
67$57 %,7
W
K4
8QB6&/.&/.32/
67$57
%,7
%,7
%,7
DDD