291
8209A–AVR–08/09
ATmega16M1/32M1/64M1
Note: 1. See Table 29-3 on page 313 for BODLEVEL Fuse decoding.
28.3 PSC Output Behavior During Reset
For external component safety reason, the state of PSC outputs during Reset can be pro-
grammed by fuses PSCRB, PSCARV & PSCBRV.
These fuses are located in the Extended Fuse Byte ( see Table 28-4)
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. See “POC – PSC Output Configuration” on page
147.
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.
BODLEVEL2
(1)
2
Brown-out Detector trigger
level
1 (unprogrammed)
BODLEVEL1
(1)
1
Brown-out Detector trigger
level
1 (unprogrammed)
BODLEVEL0
(1)
0
Brown-out Detector trigger
level
1 (unprogrammed)
Table 28-4. Extended Fuse Byte
Extended Fuse Byte Bit No Description Default Value
Table 28-5. 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
(2 pages)
(23 pages)
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