AT90PWM2B-16SE ATMEL [ATMEL Corporation], AT90PWM2B-16SE Datasheet - Page 280

• Manufacturer Part Number: AT90PWM2B-16SE
• Description: 8-bit Microcontroller with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

25.2
25.3
280
Fuse Bits
PSC Output Behaviour During Reset
AT90PWM2/3/2B/3B
The AT90PWM2/2B/3/3B has three Fuse bytes.
functionality of all the fuses and how they are mapped into the Fuse bytes. Note that the fuses
are read as logical zero, “0”, if they are programmed.
Table 25-4.
Note:
For external component safety reason, the state of PSC outputs during Reset can be pro-
grammed by fuses PSCRV, PSC0RB, PSC1RB & 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,
PSC1RB & 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 PSC0RB fuse equals 1 (unprogrammed), PSCOUT00 & PSCOUT01 keep a standard port
behaviour. If PSC0RB fuse equals 0 (programmed), PSCOUT00 & PSCOUT01 are forced at
reset to low level or high level according to PSCRV fuse bit. In this second case, PSCOUT00 &
PSCOUT01 keep the forced state until PSOC0 register is written..
If PSC1RB fuse equals 1 (unprogrammed), PSCOUT10 & PSCOUT11 keep a standard port
behaviour. If PSC1RB fuse equals 0 (programmed), PSCOUT10 & PSCOUT11 are forced at
reset to low level or high level according to PSCRV fuse bit. In this second case, PSCOUT10 &
PSCOUT11 keep the forced state until PSOC1 register is written.
If PSC2RB fuse equals 1 (unprogrammed), PSCOUT20, PSCOUT21, PSCOUT22 &
PSCOUT23 keep a standard port behaviour. If PSC1RB fuse equals 0 (programmed),
PSCOUT20, PSCOUT21, PSCOUT22 & PSCOUT23 are forced at reset to low level or high
level according to PSCRV fuse bit. In this second case, PSCOUT20, PSCOUT21, PSCOUT22 &
PSCOUT23 keep the forced state until PSOC2 register is written.
Extended Fuse Byte
PSC2RB
PSC1RB
PSC0RB
PSCRV
–
BOOTSZ1
BOOTSZ0
BOOTRST
1. The default value of BOOTSZ1..0 results in maximum Boot Size. See
for details.
Extended Fuse Byte
Bit No
4
3
2
1
0
7
6
5
Description
PSC2 Reset Behaviour
PSC1 Reset Behaviour
PSC0 Reset Behaviour
PSCOUT Reset Value
–
Select Boot Size
(see Table 113 for details)
Select Boot Size
(see Table 113 for details)
Select Reset Vector
Table 25-4
Table
-
Table 25-6
25-4)
Default Value
1
1
1
1
1
0 (programmed)
0 (programmed)
1 (unprogrammed)
Table 25-7 on page 283
describe briefly the
(1)
(1)
4317J–AVR–08/10