AT90LS8535 datasheet(55/127 Pages) ATMEL

tên linh kiện	AT90LS8535

Giải thích chi tiết về linh kiện	8-bit Microcontroller with 8K Bytes In-System Programmable Flash

PDF	127 Pages

Scroll/Zoom	100%

nhà sản xuất	ATMEL [ATMEL Corporation]

Trang chủ	http://www.atmel.com

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55 / 127 page

AT90S/LS8535

1041H–11/01

Figure 38. SPI Master-slave Interconnection

The system is single-buffered in the transmit direction and double-buffered in the

receive direction. This means that bytes to be transmitted cannot be written to the SPI

Data Register before the entire shift cycle is completed. When receiving data, however,

a received byte must be read from the SPI Data Register before the next byte has been

completely shifted in. Otherwise, the first byte is lost.

When the SPI is enabled, the data direction of the MOSI, MISO, SCK and SS pins is

overridden according to Table 22.

Note:

See “Alternate Functions of Port B” on page 79 for a detailed description of how to

define the direction of the user-defined SPI pins.

Table 22. SPI Pin Overrides

Direction, Master SPI

Direction, Slave SPI

MOSI

User Defined

Input

MISO

Input

User Defined

SCK

User Defined

Input

User Defined

Input

MSB

MASTER

LSB

8 BIT SHIFT REGISTER

MSB

MASTER

LSB

8 BIT SHIFT REGISTER

MISO

MOSI

SPI

CLOCK GENERATOR

SCK

MISO

MOSI

SCK

VCC

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