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ML51/ML54/ML56
Sep. 01, 2020
Page
78
of 719
Rev 2.00
ML
51
/ML
54
/ML
5
6 S
E
RI
E
S
TECHNI
CA
L
RE
F
E
R
E
NC
E
M
A
NU
A
L
ML51/M
L54
/M
L56
Series
Tec
hnical Reference
Manual
Group
Pin Name
Type
Description
UART2_TXD
O
UART2 data transmitter output pin.
UART3
UART3_RXD
I
UART3 data receiver input pin.
UART3_TXD
O
UART3 data transmitter output pin.
V
REF
V
REF
A
ADC reference voltage input.
Note:
This pin needs to be connected with a 1uF capacitor when
use internal voltage reference output.
X32
X32_IN
I
External 32.768 kHz crystal input pin.
X32_OUT
O
External 32.768 kHz crystal output pin.
XT1
XT1_IN
I
External 4~24 MHz (high speed) crystal input pin.
XT1_OUT
O
External 4~24 MHz (high speed) crystal output pin.