AT90S8535 datasheet(88/127 Pages) ATMEL

Part #	AT90S8535

Description	8-bit Microcontroller with 8K Bytes In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

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AT90S/LS8535

1041H–11/01

• OC1A – Port D, Bit 5

OC1A, Output compare matchA output: The PD5 pin can serve as an external output for

the Timer/Counter1 output compareA. The pin has to be configured as an output (DDD5

set [one]) to serve this function. See the timer description on how to enable this function.

The OC1A pin is also the output pin for the PWM mode timer function.

• OC1B – Port D, Bit 4

OC1B, Output compare matchB output: The PD4 pin can serve as an external output for

the Timer/Counter1 output compareB. The pin has to be configured as an output (DDD4

set [one]) to serve this function. See the timer description on how to enable this function.

The OC1B pin is also the output pin for the PWM mode timer function.

• INT1 – Port D, Bit 3

INT1, External Interrupt source 1: The PD3 pin can serve as an external interrupt source

to the MCU. See the interrupt description for further details and how to enable the

source.

• INT0 – Port D, Bit 2

INT0, External Interrupt source 0: The PD2 pin can serve as an external interrupt source

to the MCU. See the interrupt description for further details and how to enable the

source.

• TXD – Port D, Bit 1

Transmit Data (data output pin for the UART). When the UART Transmitter is enabled,

this pin is configured as an output, regardless of the value of DDD1.

• RXD – Port D, Bit 0

Receive Data (data input pin for the UART). When the UART Receiver is enabled, this

pin is configured as an input, regardless of the value of DDD0. When the UART forces

this pin to be an input, a logical “1” in PORTD0 will turn on the internal pull-up.

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