AT90PWM2 datasheet(79/365 Pages) ATMEL

79 / 365 page

4317K–AVR–03/2013

AT90PWM2/3/2B/3B

• XTAL1/OC0B – Bit 1

XTAL1: Chip clock Oscillator pin 1. Used for all chip clock sources except internal calibrated RC

Oscillator. When used as a clock pin, the pin can not be used as an I/O pin.

OC0B, Output Compare Match B output: This pin can serve as an external output for the

Timer/Counter0 Output Compare B. The pin has to be configured as an output (DDE1 set “one”)

to serve this function. This pin is also the output pin for the PWM mode timer function.

• RESET/OCD – Bit 0

RESET, Reset pin: When the RSTDISBL Fuse is programmed, this pin functions as a normal I/O

pin, and the part will have to rely on Power-on Reset and Brown-out Reset as its reset sources.

When the RSTDISBL Fuse is unprogrammed, the reset circuitry is connected to the pin, and the

pin can not be used as an I/O pin.

If PE0 is used as a reset pin, DDE0, PORTE0 and PINE0 will all read 0.

Table 11-13 relates the alternate functions of Port E to the overriding signals shown in Figure

11-5 on page 67.

Table 11-13. Overriding Signals for Alternate Functions in PE2..PE0

Signal Name

PE2/ADC0/

XTAL2

PE1/OC0B

PE0/RESET/

OCD

PUOE

PUOV

DDOE

DDOV

PVOE

OC0Ben

PVOV

OC0B

DIEOE

ADC0D

DIEOV

AIO

Osc Output

ADC0

Osc / Clock input

AT90PWM2 Datasheet(PDF) 79 Page - ATMEL Corporation