AT90S8535 datasheet(60/127 Pages) ATMEL | 8-bit Microcontroller with 8K Bytes In-System Programmable Flash

Part #	AT90S8535

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

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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AT90S/LS8535

1041H–11/01

is selected (the CHR9 bit in the UART Control Register, UCR is set), the TXB8 bit in

UCR is transferred to bit 9 in the Transmit shift register.

On the baud rate clock following the transfer operation to the shift register, the start bit is

shifted out on the TXD pin. Then follows the data, LSB first. When the stop bit has been

shifted out, the shift register is loaded if any new data has been written to the UDR dur-

ing the transmission. During loading, UDRE is set. If there is no new data in the UDR

register to send when the stop bit is shifted out, the UDRE flag will remain set until UDR

is written again. When no new data has been written and the stop bit has been present

on TXD for one bit length, the TX Complete flag (TXC) in USR is set.

The TXEN bit in UCR enables the UART Transmitter when set (one). When this bit is

cleared (zero), the PD1 pin can be used for general I/O. When TXEN is set, the UART

Transmitter will be connected to PD1, which is forced to be an output pin regardless of

the setting of the DDD1 bit in DDRD.

Data Reception

Figure 42 shows a block diagram of the UART Receiver.

Figure 42. UART Receiver

The receiver front-end logic samples the signal on the RXD pin at a frequency 16 times

the baud rate. While the line is idle, one single sample of logical “0” will be interpreted as

the falling edge of a start bit and the start bit detection sequence is initiated. Let sample

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