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AT89C5132-ROTIL датащи(PDF) 123 Page - ATMEL Corporation

номер детали AT89C5132-ROTIL
подробное описание детали  USB Microcontroller with 64K Bytes Flash Memory
PDF  181 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5132-ROTIL датащи(HTML) 123 Page - ATMEL Corporation

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123
4173D–USB–02/06
AT89C5132
AT89C5132 captures data from the SI line while the selected slave captures data from the SO
line.
For simplicity, the following figures depict the SPI waveforms in idealized form and do not pro-
vide precise timing information. For timing parameters refer to the Section “AC Characteristics”.
Note:
1. When the peripheral is disabled (SPEN = 0), default SCK line is high level.
Figure 19-5. Data Transmission Format (CPHA = 0)
Figure 19-6. Data Transmission Format (CPHA = 1)
19.1.5
SS Management
Figure 19-5 shows an SPI transmission with CPHA = 0, where the first SCK edge is the MSB
capture point. Therefore the slave starts to output its MSB as soon as it is selected: SS asserted
to low level. SS must then be deasserted between each byte transmission (see Figure 19-7).
SPDAT must be loaded with data before SS is asserted again.
1
2
3
4
5
6
7
8
MSB
bit 1
LSB
bit 2
bit 4
bit 3
bit 6
bit 5
bit 1
bit 2
bit 4
bit 3
bit 6
bit 5
MSB
LSB
MOSI (from Master)
MISO (from Slave)
SCK (CPOL = 1)
SCK (CPOL = 0)
SPEN (Internal)
SCK Cycle Number
SS (to Slave)
to Capture Point
1
2
3
4
5
6
7
8
MSB
bit 1
LSB
bit 2
bit 4
bit 3
bit 6
bit 5
bit 1
bit 2
bit 4
bit 3
bit 6
bit 5
MSB
LSB
MOSI (from Master)
MISO (from Slave)
SCK (CPOL = 1)
SCK (CPOL = 0)
SPEN (Internal)
SCK Cycle Number
SS (to Slave)
Capture Point



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