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AT90PWM3B-16SE Datasheet(PDF) 77 Page - ATMEL Corporation |
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AT90PWM3B-16SE Datasheet(HTML) 77 Page - ATMEL Corporation |
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77 / 361 page  77 4317J–AVR–08/10 AT90PWM2/3/2B/3B 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 66. 11.4 Register Description for I/O-Ports 11.4.1 Port B Data Register – PORTB 11.4.2 Port B Data Direction Register – DDRB Table 11-13. Overriding Signals for Alternate Functions in PE2..PE0 Signal Name PE2/ADC0/ XTAL2 PE1/OC0B PE0/RESET/ OCD PUOE 0 0 0 PUOV 0 0 0 DDOE 0 0 0 DDOV 0 0 0 PVOE 0 OC0Ben 0 PVOV 0 OC0B 0 DIEOE ADC0D 0 0 DIEOV 0 0 0 DI AIO Osc Output ADC0 Osc / Clock input Bit 76543210 PORTB7 PORTB6 PORTB5 PORTB4 PORTB3 PORTB2 PORTB1 PORTB0 PORTB Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 00000000 Bit 76543210 DDB7 DDB6 DDB5 DDB4 DDB3 DDB2 DDB1 DDB0 DDRB Read/Write R/W R/W R/W R/W R/W R/W R/W R/W |
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