AT90PWM2 datasheet(280/361 Pages) ATMEL

280 / 361 page

280

4317J–AVR–08/10

AT90PWM2/3/2B/3B

25.2

Fuse Bits

The AT90PWM2/2B/3/3B has three Fuse bytes. Table 25-4 - Table 25-6 describe briefly the

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.

Note:

1. The default value of BOOTSZ1..0 results in maximum Boot Size. See Table 25-7 on page 283

for details.

25.3

PSC Output Behaviour During Reset

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 Table 25-4)

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.

Table 25-4.

Extended Fuse Byte

Bit No

Description

Default Value

PSC2RB

PSC2 Reset Behaviour

PSC1RB

PSC1 Reset Behaviour

PSC0RB

PSC0 Reset Behaviour

PSCRV

PSCOUT Reset Value

–3

–

BOOTSZ1

Select Boot Size

(see Table 113 for details)

0 (programmed)(1)

BOOTSZ0

Select Boot Size

(see Table 113 for details)

0 (programmed)(1)

BOOTRST

Select Reset Vector

1 (unprogrammed)

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