M052LDN Datasheet, PDF (19/86 Pages) List of Unclassifed Manufacturers – 32-bit Microcontroller

M051 DN/DE
4.4 Pin Description
Pin Number
Symbol
QFN33 LQFP48
Alternate Function
1
2
3
Type^[1]
Description
11
16 XTAL1
I External 4~24 MHz (high speed) crystal input pin.
(ST)
10
15 XTAL2
O External 4~24 MHz (high speed) crystal output pin.
27
41
VDD
P
Power supply to I/O ports and LDO source for internal PLL
and digital circuit.
12
17
VSS
33
P Ground pin for digital circuit.
28
42
AVDD
P Power supply to internal analog circuit.
4
6
AVSS
P Analog Ground pin for analog circuit.
13
18 LDO_CAP
LDO output pin.
P _{Note: This pin needs to be connected with a 1uF}
capacitor.
2
4
nRST
The nRST pin is a Schmitt trigger input pin for hardware
device reset. A “Low” on this pin for 768 clock counter of
I _{Internal RC 22M while the system clock is running will}
(ST) reset the device. The nRST pin has an internal pull-up
resistor allowing power-on reset by simply connecting an
external capacitor to GND.
26
40
25
39
NC
38
NC
37
24
35
23
34
22
33
21
32
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
CTS1
TXD1^[2],
The P0.0 ~ P0.7 pins are called Port 0. Port 0 is a general
AD0 _{ACMP3_P} I/O _{purpose I/O port, which can be configured as Input,}
Output, Quasi Bi-direction and Open-drain mode.
RTS1
AD1
RXD1^[2],
Port 0 supports multi-function pins, including CTS1, RTS1,
/O ^{CTS0, RTS0, SPISS1, MOSI_1, MISO_1, SPICLK1, AD0}
ACMP3_N
~ AD7, TXD1, RXD1, TXD, RXD, ACMP3_P, and
ACMP3_N.
CTS0 AD2
TXD^[2]
I/O ^{AD0 ~ AD7 belong to EBI function for external memory}
accessing.
RTS0 AD3
RXD^[2]
I/O ^{The SPISS1, MOSI_1, MISO_1, and SPICLK1 pins are for}
SPI function.
SPISS1 AD4
I/O
The CTS0 and CTS1 pins are clear to send input pin for
UART0/1.
MOSI_1 AD5
The RTS0 and RTS1 pins are Request to Send output pin
I/O _{for UART0/1.}
MISO_1 AD6
The RXD and TXD pins are for UART0 function.
I/O _{The RXD1 and TXD1 pins are for UART1 function.}
SPICLK1 AD7
The ACMP3_N and ACMP3_P pins are for ACMP3
I/O _{negative/positive inputs.}
29
43
NC
44
P1.0
P1.1
T2
AIN0 nWRL I/O The P1.0 ~ P1.7 pins are called Port 1. Port 1 is a general
purpose I/O port, which can be configured as Input,
Output, Quasi-bidirectional and Open-drain mode.
T3
AIN1 nWRH I/O
Oct. 05, 2015
Page 19 of 86
Rev 1.03