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ATTINY817-MFR. Datasheet(PDF) 148 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) 148 Page - Microchip Technology

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Figure 20-5. Period and Compare Double Buffering
UPDATE
"write enable"
"data write"
CNT
"match"
EN
EN
CMPnBUF
CMPn
BV
=
Both the TCA.CMPn and TCA.CMPnBUF registers are available as I/O registers. This allows initialization
and bypassing of the buffer register and the double buffering function.
20.3.3.3 Changing the Period
The Counter period is changed by writing a new TOP value to the Period register (TCA.PER).
No Buffering: If double buffering is not used, any period update is immediate.
Figure 20-6. Changing the Period without Buffering
CNT
MAX
BOTTOM
Counter wraparound
"update"
"write"
New TOP written to
PER that is higher
than current CNT.
New TOP written to
PER that is lower
than current CNT.
A counter wraparound can occur in any mode of operation when up-counting without buffering. This is
due to the fact that the registers TCA.CNT and TCA.PER are continuously compared: if a new TOP value
is written to TCA.PER that is lower than current TCA.CNT, the counter will wrap first before a compare
match happened.
Figure 20-7. Unbuffered Dual-slope Operation
Counter wraparound
"update"
"write"
MAX
BOTTOM
CNT
New TOP written to
PER that is higher
than current CNT.
New TOP written to
PER that is lower
than current CNT.
ATtiny417/817
© 2017 Microchip Technology Inc.
Datasheet Complete
DS40001901B-page 148



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