AT90PWM2 datasheet(289/365 Pages) ATMEL

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AT90PWM2/3

4317B–AVR–02/05

Fuse Bits

The AT90PWM2/3 has three Fuse bytes. Table 120 - Table 122 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 123 on

page 292 for details.

PSC Output Behaviour

During Reset

For external component safety reason, the state of PSC outputs during Reset can be

programmed by fuses PSCRV, PSC0RB, PSC1RB & PSC2RB.

These fuses are located in the Extended Fuse Byte ( see Table 120)

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 120. Extended Fuse Byte

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)

AT90PWM2 Datasheet(PDF) 289 Page - ATMEL Corporation

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