at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 145

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

13.26.4
7734M–AVR–03/10
PSC Output Behavior During Reset
Table 13-22.
• Bit 0 – PEOPn: End Of PSC n Interrupt
This bit is set by hardware when PSC n achieves its whole cycle.
Must be cleared by software by writing a one to its location.
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 :
Table 13-23.
Notes:
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.
PRNn1
0
1
1
Extended Fuse Byte
PSC2RB
PSC2RBA
PSCRRB
PSCRV
PSCINRB
BODLEVEL2
BODLEVEL1
BODLEVEL0
1. See
PRNn0
1
0
1
(1)
(1)
(1)
PSC n Ramp Number Description
Extended Low Fuse Byte
Table 8-2 on page 52
Description
The last event which has generated an interrupt occurred during ramp 2
The last event which has generated an interrupt occurred during ramp 3
The last event which has generated an interrupt occurred during ramp 4
Bit No
7
6
5
4
3
2
1
0
for BODLEVEL Fuse decoding
Description
PSC2 Reset Behavior
PSC2 Reset Behavior for
OUT22 & 23
PSC Reduced Reset Behavior
PSCOUT & PSCOUTR Reset
Value
PSC & PSCR Inputs Reset
Behavior
Brown-out Detector trigger level
Brown-out Detector trigger level
Brown-out Detector trigger level
Default Value
1
1
1
1
1
1 (unprogrammed)
0 (programmed)
1 (unprogrammed)
AT90PWM81
145