M263 datasheet(296/398 Pages) NUVOTON

296 / 398 page

M261/M262/M263

Mar 25, 2020

Page 296 of 398

Rev 1.02

XT1_OUT

External 4~24

MHz Crystal

(HXT)

HXTEN (CLK_PWRCTL[0])

XT1_IN

Internal 12 MHz

Oscillator

(HIRC)

HIRCEN (CLK_PWRCTL[2])

PLL

PLLSRC (CLK_PLLCTL[19])

PLL FOUT

X32_OUT

External 32.768

kHz Crystal

(extLXT)

LXT

LXTEN (CLK_PWRCTL[1])

X32_IN

Internal 10 kHz

Oscillator

(LIRC)

LIRCEN (CLK_PWRCTL[3])

HXT

HIRC

LIRC

Internal 48 MHz

Oscillator

(HIRC48)

HIRC48EN (CLK_PWRCTL[18])

HIRC48

Note:

Before clock switching, both the pre-selected and newly selected clock sources must be

turned on and stable.

Internal 32 kHz

Oscillator

(LIRC32k)

C32KS(RTC_LXTCTL[7])

LIRC32KEN (RTC_LXTCTL[0])

Figure 6.3-4 Clock Generator Block Diagram

Each of these clock sources has certain stable time to wait for clock operating at stable frequency.

When clock source is enabled, a stable counter start counting and correlated clock stable index.

That is, HXTSTB (CLK_STATUS[0]), LXTSTB (CLK_STATUS[1]), PLLSTB (CLK_STATUS[2]),

LIRCSTB

(CLK_STATUS[3]),

HIRCSTB

(CLK_STATUS[4]),

HIRC48STB

(CLK_STATUS[6]),

EXTLXTSTB (CLK_STATUS[8]) and LIRC32STB(CLK_STATUS[9]) these bits are set to 1 after the

stable counter value reaches a defined value.

M263 Datasheet(PDF) 296 Page - Nuvoton Technology Corporation

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