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ATTINY817-MFR. Datasheet(PDF) 65 Page - Microchip Technology

Part # ATTINY817-MFR.
Description  AVR짰 Microcontroller with Core Independent Peripherals and picoPower짰 Technology
PDF  492 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

ATTINY817-MFR. Datasheet(HTML) 65 Page - Microchip Technology

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Value
Name
Description
0x0
OSC20M
16/20MHz internal oscillator
0x1
OSCULP32K
32KHz internal Ultra Low Power oscillator
0x2
XOSC32K
32.768kHz external crystal oscillator
0x3
EXTCLK
External clock
10.5.2
Main Clock Control B
Name: 
MCLKCTRLB
Offset:  0x01
Reset: 
0x11
Property:
 
Configuration Change Protection
Bit
7
6
5
4
3
2
1
0
PDIV[3:0]
PEN
Access
R
R
R
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
1
0
0
0
1
Bits 4:1 – PDIV[3:0]: Prescaler Division
If the Prescaler Enable (PEN) bit is written to '1', these bits define the division ratio of the Main Clock
prescaler.
These bits can be written during run-time to vary the clock frequency of the system to suit the application
requirements.
User software must ensure a correct configuration of input frequency (CLK_MAIN) and Prescaler settings,
such that the resulting frequency of CLK_PER never exceeds the allowed maximum (see Electrical
Characteristics).
Value
Description
Value
Division
0x0
2
0x1
4
0x2
8
0x3
16
0x4
32
0x5
64
0x8
6
0x9
10
0xA
12
0xB
24
0xC
48
other
Reserved
Bit 0 – PEN: Prescaler Enable
This bit must be written '1' to enable the prescaler. When enabled, the division ratio is selected by the
PDIV bit field.
When this bit is written to '0', the Main Clock will pass through undivided (CLK_PER=CLK_MAIN),
regardless of the value of PDIV.
ATtiny417/817
© 2017 Microchip Technology Inc.
Datasheet Complete
DS40001901B-page 65



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