at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 250

• Manufacturer Part Number: at90pwm81-16se
• Description: 8-bit Avr Microcontroller With 8k Bytes In- System Programmable Flash
• Manufacturer: ATMEL Corporation

22.2.1
22.2.2
250
AT90PWM81
PSC Output Behavior During Reset
PSC Input Behavior During Reset
Table 22-4.
Notes:
For external component safety reason, the state of PSC outputs during Reset can be programmed by fuses
PSCRV, PSCRRB & PSC2RB.
These fuses are located in the Extended Fuse Byte ( see
PSCRV gives the state low or high which will be forced on PSC outputs selected by PSC0RB & PSC2RB
fuses.
If PSCRV fuse equals 0 (programmed), the selected PSC outputs will be forced to low state. If PSCRV
fuse equals 1 (unprogrammed), the selected PSC outputs will be forced to high state.
If PSCRRB fuse equals 1 (unprogrammed), PSCOUTR0 & PSCOUTR1 keep a standard port behavior. If
PSC0RB fuse equals 0 (programmed), PSCOUTR0 & PSCOUTR1 are forced at reset to low level or high
level according to PSCRV fuse bit. In this second case, PSCOUTR0 & PSCOUTR1 keep the forced state
until PSOC0 register is written.
If PSC2RB fuse equals 1 (unprogrammed), PSCOUT20 & PSCOUT21 keep a standard port behavior. If
PSC2RB fuse equals 0 (programmed), PSCOUT20 & PSCOUT21 are forced at reset to low level or high
level according to PSCRV fuse bit. In this second case, PSCOUT20 & PSCOUT21 keep the forced state
until PSOC2 register is written.
If PSC2RBA fuse equals 1 (unprogrammed), PSCOUT22 & PSCOUT23 keep a standard port behavior. If
PSC2RBA fuse equals 0 (programmed), PSCOUT22 & PSCOUT23 are forced at reset to low level or
high level according to PSCRV fuse bit. In this second case, PSCOUT22 & PSCOUT23 keep the forced
state until PSOC2 register is written.
For power consumption under reset reason, the state of PSC & PSCR inputs during Reset can be pro-
grammed by fuse PSCINRB.
If PSCINRB fuse equals 1 (unprogrammed), PSC & PSCR input keep a standard port behavior. If
PSCINRB fuse equals 0 (programmed), PSC & PSCR input pull-up are forced while the reset is active.
Affected pins are PSCIN2, PSCINr, PSCIN2A, PSCINrA. To prevent any conflict on PD1, this fuse has
no effect on PSCINrB.
Extended Fuse Byte
BODLEVEL2
BODLEVEL1
BODLEVEL0
1. See
(1)
(1)
(1)
Extended Low Fuse Byte
Table 8-2 on page 52
Bit No
2
1
0
for BODLEVEL Fuse decoding
Description
Brown-out Detector trigger level
Brown-out Detector trigger level
Brown-out Detector trigger level
Table
22-4)
Default Value
1 (unprogrammed)
0 (programmed)
1 (unprogrammed)
7734M–AVR–03/10