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AT89LP2052 bảng dữ liệu(PDF) 45 Page - ATMEL Corporation

tên linh kiện AT89LP2052
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 2/4-Kbyte Flash
PDF  90 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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AT89LP2052 bảng dữ liệu(HTML) 45 Page - ATMEL Corporation

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45
3547F–MICRO–6/06
AT89LP2052/LP4052
Figure 18-4. SPI Transfer Format with CPHA = 0
Note:
*Not defined but normally MSB of character just received
Figure 18-5. SPI Transfer Format with CPHA = 1
Note:
*Not defined but normally LSB of previously transmitted character
18.4
SPI Pin Configuration
Before using the Serial Peripheral Interface the four SPI pins – SCK, MISO, MOSI and SS –
must be properly configured for the desired functionality. See Section 14.7 “Port Alternate Func-
tions” on page 20. When the SPI is in Master mode, SCK and MOSI must be configured as
bidirectional or output, with P1.7 and P1.5 set to “1”. MISO should be input-only, or bidirectional
with P1.6 set to “1”. When the SPI is in Slave mode, SCK, MOSI and SS must be configured as
input-only, or as bidirectional with P1.7, P1.6 and P1.4 set to “1”. MISO should be set as bidirec-
tional or output, with P1.6 set to “1”. If all four pins are set as bidirectional and their respectively
port bits are all “1”, it is possible to switch between Master and Slave mode without reconfiguring
the pins.
MSB
6
5
4
3
2
1
LSB
1
2
3
4
5
6
7
8
MSB
*
65
4
3
2
1
LSB
SCK CYCLE #
(FOR REFERENCE)
SCK (CPOL = 0)
SCK (CPOL = 1)
MOSI
(FROM MASTER)
MISO
(FROM SLAVE)
SS (TO SLAVE)



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