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AT83C5111 датащи(PDF) 38 Page - ATMEL Corporation

номер детали AT83C5111
подробное описание детали  Low Pin Count 8-bit Microcontroller with A/D Converter
PDF  86 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT83C5111 датащи(HTML) 38 Page - ATMEL Corporation

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38
AT8xC5111
4190A–8051–11/02
Figure 16 shows an SPI transmission in which CPHA is ’1’. In this case, the Master
begins driving its MOSI pin on the first SCK edge. Therefore the Slave uses the first
SCK edge as a start transmission signal. The SS pin can remain low between transmis-
sions (Figure 17). This format may be preferable in systems having only one Master and
only one Slave driving the MISO data line.
Figure 5. Data Transmission Format (CPHA = 1)
Figure 15 shows the first SCK edge is the MSB capture strobe. Therefore, the Slave
must begin driving its data before the first SCK edge, and a falling edge on the SS pin is
used to start the transmission. The SS pin must be toggled high and then low between
each byte transmitted (Figure 17).
Figure 6. CPHA/SS Timing
MSB
bit6
bit5
bit4
bit3
bit2
bit1
LSB
bit6
bit5
bit4
bit3
bit2
bit1
MSB
LSB
13
2
4
567
8
Capture Point
SS (to Slave)
MISO (from Slave)
MOSI (from Master)
SCK (CPOL = 1)
SCK (CPOL = 0)
SPEN (Internal)
SCK Cycle Number
Byte 1
Byte 2
Byte 3
MISO/MOSI
Master SS
Slave SS
(CPHA = 1)
Slave SS
(CPHA = 0)



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