AT89LP428 datasheet(125/149 Pages) ATMEL

부품명	AT89LP428

상세설명	8-bit Microcontroller with 4K/8K Bytes In-System Programmable Flash

PDF	149 Pages

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제조업체	ATMEL [ATMEL Corporation]

홈페이지	http://www.atmel.com

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125 / 149 page

125

3654A–MICRO–8/09

AT89LP428/828

23.9.5

Serial Peripheral Interface

The Serial Peripheral Interface (SPI) is a byte-oriented full-duplex synchronous serial communi-

cation channel. During In-System Programming, the programmer always acts as the SPI master

and the target device always acts as the SPI slave. The target device receives serial data on

MOSI and outputs serial data on MISO. The Programming Interface implements a standard

SPI Port with a fixed data order. For In-System Programming, bytes are transferred MSB first as

shown in Figure 23-9. The SCK phase and polarity follow SPI clock mode 0 (CPOL = 0, CPHA =

0) where bits are sampled on the rising edge of SCK and output on the falling edge of SCK. For

more detailed timing information see Figure 23-10.

Figure 23-9. ISP Byte Sequence

Figure 23-10. Serial Programming Interface Timing

MOSI

MISO

SCK

Data Sampled

tSR

tSSE

tSLSH

tSOV

tSF

tSOX

tSSD

tSCK

tSHSL

tSOE

tSOH

tSIH

tSIS

SCK

MISO

MOSI

AT89LP428 데이터시트(PDF) 125 Page - ATMEL Corporation