AT90S8535 datasheet(54/127 Pages) ATMEL

Part #	AT90S8535

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

Download	127 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

Logo

54 / 127 page

54

AT90S/LS8535

1041H–11/01

Serial Peripheral

Interface – SPI

The Serial Peripheral Interface (SPI) allows high-speed synchronous data transfer

between the AT90S8535 and peripheral devices or between several AVR devices. The

AT90S8535 SPI features include the following:

• Full-duplex, 3-wire Synchronous Data Transfer

• Master or Slave Operation

• LSB First or MSB First Data Transfer

• Four Programmable Bit Rates

• End-of-transmission Interrupt Flag

• Write Collision Flag Protection

• Wake-up from Idle Mode

Figure 37. SPI Block Diagram

The interconnection between master and slave CPUs with SPI is shown in Figure 38.

The PB7(SCK) pin is the clock output in the Master Mode and is the clock input in the

Slave Mode. Writing to the SPI Data Register of the master CPU starts the SPI clock

generator and the data written shifts out of the PB5(MOSI) pin and into the PB5(MOSI)

pin of the slave CPU. After shifting one byte, the SPI clock generator stops, setting the

end-of-transmission flag (SPIF). If the SPI interrupt enable bit (SPIE) in the SPCR regis-

ter is set, an interrupt is requested. The Slave Select input, PB4(SS), is set low to select

an individual slave SPI device. The two shift registers in the master and the slave can be

considered as one distributed 16-bit circular shift register. This is shown in Figure 38.

When data is shifted from the master to the slave, data is also shifted in the opposite

direction, simultaneously. During one shift cycle, data in the master and the slave is

interchanged.

Similar Part No. - AT90S8535

Manufacturer	Part #	Datasheet	Description
ATMEL Corporation	AT90S8535	482Kb / 10P	8-Bit Microcontroller with 4K/8K Bytes In-System Programmable Flash
List of Unclassifed Man...	AT90S8535	75Kb / 2P	AVR-P40B-8535 PROTOTYPE BOARD WITH 10 PIN ICSP CONNECTOR FOR AT90S8535 AVR MICROCONTROLLERS
ATMEL Corporation	AT90S8535	2Mb / 61P	AVR Studio Compatible Rev. 1925C-AVR-3/03
	AT90S8535-8AC	482Kb / 10P	8-Bit Microcontroller with 4K/8K Bytes In-System Programmable Flash
	AT90S8535-8AI	482Kb / 10P	8-Bit Microcontroller with 4K/8K Bytes In-System Programmable Flash

Manufacturer	Part #	Datasheet	Description
ATMEL Corporation	ATMEGA48V	3Mb / 374P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash
	ATMEGA88	369Kb / 10P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash
	AT89LP51	4Mb / 113P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash
	ATMEGA8515	1Mb / 257P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash
	AT89S52	576Kb / 38P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash
	ATMEGA88	210Kb / 20P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash
	ATTINY25B	254Kb / 7P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash
	AT90PWM3	3Mb / 365P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash
	AT90PWM1	399Kb / 20P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash
	AT89S52	478Kb / 39P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash
	AT90S8515	2Mb / 112P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash