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M263 Datasheet(PDF) 366 Page - Nuvoton Technology Corporation

Part # M263
Description  Arm짰 Cortex짰-M 32-bit Microcontroller
PDF  398 Pages
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Manufacturer  NUVOTON [Nuvoton Technology Corporation]
Direct Link  http://www.nuvoton.com
Logo NUVOTON - Nuvoton Technology Corporation

M263 Datasheet(HTML) 366 Page - Nuvoton Technology Corporation

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M261/M262/M263
Mar 25, 2020
Page 366 of 398
Rev 1.02
8.4.3
External 32.768 kHz Low Speed Crystal (LXT) Characteristics
The low-speed external (LXT) clock can be supplied with a 32.768 kHz crystal/ceramic resonator
oscillator. All the information given in this secion are based on characterization results obtained with
typical external components. In the application, the external components have to be placed as close
as possible to the X32_OUT and X32_IN pins and must not be connected to any other devices in
order to minimize output distortion and startup stabilization time. Refer to the crystal resonator
manufacturer for more details on the resonator characteristics (frequency, package, accuracy).
Symbol
Parameter
Min.
Typ.
Max. Unit
Test Conditions
VBAT
Operation Voltage
1.7
-
3.6
V
fLXT
Oscillator frequency
-
32.768
-
kHz
VBAT = 1.7 ~ 3.6 V
TLXT
Temperature
-40
-
105
C
ILXT
Operating current
-
0.45
-
A
VBAT = 3.3V
Duty cycle
45
-
55
%
TS
Stable Time
-
372
-
ms
Note: Guaranteed by characterization, not tested in production.
Table 8.4-2 External 32.768 kHz Crystal
8.4.3.1
Typical Crystal Application Circuits
Crystal
C1
C2
32.768 kHz
5~20pF
5~20pF
XT_IN
XT_OUT
C1
C2
Figure 8.4-2 Typical Crystal Application Circuit
8.4.4
External 32.768 kHz Low Speed Crystal (OSC) Input Clock
Parameter
Symbol
Min.
Typ.
Max.
Unit
Test Conditions
Clock High Time
tCHCX
450
-
-
ns
Clock Low Time
tCLCX
450
-
-
ns
Clock Rise Time
tCLCH
-
-
50
ns



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