Datasheet

Extended Fuse Byte Bit No. Description Default Value
PSCRB 5 PSC reset behavior 1 (unprogrammed)
PSCRVA 4 PSCOUTnA reset value 1 (unprogrammed)
PSCRVB 3 PSCOUTnB reset value 1 (unprogrammed)
BODLEVEL2 2 Brown-out detector trigger level 1 (unprogrammed)
BODLEVEL1 1 Brown-out detector trigger level 1 (unprogrammed)
BODLEVEL0 0 Brown-out detector trigger level 1 (unprogrammed)
Related Links
System and reset characteristics on page 399
Alternate Port Functions on page 98
WDTCSR on page 74
Calibrated Internal RC Oscillator on page 51
28.3. PSC Output Behavior During Reset
For external component safety reason, the state of PSC outputs during Reset can be programmed by
fuses PSCRB, PSCARV & PSCBRV.
These fuses are located in the Extended Fuse byte
If PSCRB fuse equals 1 (unprogrammed), all PSC outputs keep a standard port behaviour. If PSC0RB
fuse equals 0 (programmed), all PSC outputs are forced at reset to low level or high level according to
PSCARV and PSCBRV fuse bits. In this second case, the PSC outputs keep the forced state until POC
register is written.
PSCARV (PSCOUTnA Reset Value) gives the state low or high which will be forced on PSCOUT0A,
PSCOUT1A, and PSCOUT2A outputs when PSCRB is programmed. If PSCARV fuse equals 0
(programmed), the PSCOUT0A, PSCOUT1A, and PSCOUT2A outputs will be forced to high state. If
PSCRV fuse equals 1 (unprogrammed), the PSCOUT0A, PSCOUT1A, and PSCOUT2A outputs will be
forced to low state.
PSCBRV (PSCOUTnB Reset Value) gives the state low or high which will be forced on PSCOUT0B,
PSCOUT1B, and PSCOUT2B outputs when PSCRB is programmed. If PSCBRV fuse equals 0
(programmed), the PSCOUT0B, PSCOUT1B and PSCOUT2B outputs will be forced to high state. If
PSCRV fuse equals 1 (unprogrammed), the PSCOUT0B, PSCOUT1B, and PSCOUT2B outputs will be
forced to low state.
Table 28-6. PSC output behavior during and after reset until POC register is written
PSCRB PSCARV PSCBRV PSCOUTnA PSCOUTnB
unprogrammed X X normal port normal port
programmed unprogrammed unprogrammed forced low forced low
programmed unprogrammed programmed forced low forced high
programmed programmed unprogrammed forced high forced low
programmed programmed programmed forced high forced high
Atmel ATmega16M1/32M1/64M1 [DATASHEET]
Atmel-8209F-ATmega16M1/32M1/64M1_Datasheet_Complete-10/2016
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