ATTINY817-MFR. datasheet(69/492 Pages) MICROCHIP

69 / 492 page

It takes 4 oscillator cycles to open the clock gate after a request but the oscillator analog start-up time will

be removed when this bit is set.

10.5.9

32.768kHz Crystal Oscillator Control A

The SEL and CSUT bits cannot be changed as long as the ENABLE bit is set or the XOSC32K Stable bit

(XOSC32KS) in CLKCTRL.MCLKSTATUS is high.

To change settings in a safe way: write a '0' to the ENABLE bit and wait until XOSC32KS is '0' before re-

enabling the XOSC32K with new settings.

Name:

XOSC32KCTRLA

Offset: 0x1C

Reset:

0x00

Property:

Configuration Change Protection

Bit

CSUT[1:0]

SEL

RUNSTDBY

ENABLE

Access

R/W

Reset

Bits 5:4 – CSUT[1:0]: Crystal Start-Up Time

These bits select the start-up time for the XOSC32K. It is write protected when the oscillator is enabled

(ENABLE=1).

If SEL=1, the start-up time will not be applied.

Value

Name

Description

0x0

1k cycles

0x1

16K

16k cycles

0x2

32K

32k cycles

0x3

64K

64k cycles

Bit 2 – SEL: Source Select

This bit select the external source type. It is write protected when the oscillator is enabled (ENABLE=1).

Value

Description

External crystal

External clock on TOSC1 pin

Bit 1 – RUNSTDBY: Run Standby

Writing this bit to '1' starts the crystal oscillator and forces the oscillator on in all modes, even when

unused by the system if the ENABLE bit is set. In standby sleep mode this can be used to ensure

immediate wake-up and not waiting for oscillator start-up time. When this bit is '0', the crystal oscillator is

only running when requested and the ENABLE bit is set.

The output of XOSC32K is not sent to other peripherals unless it is requested by one or more peripherals.

When the RUNSTDBY bit is set there will only be a delay of two to three crystal oscillator cycles after a

request until the oscillator output is received, if the initial crystal start-up time already has completed.

According to RUNSTBY bit, the oscillator will be turned on all the time if the device is in Active, Idle or

Standby sleep mode, or only be enabled when requested.

This bit is I/O protected to prevent unintentional enabling of the oscillator.

ATtiny417/817

Datasheet Complete

DS40001901B-page 69

ATTINY817-MFR. Datasheet(PDF) 69 Page - Microchip Technology

ATTINY817-MFR. Datasheet(HTML) 69 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL