Rainbow-electronics ATmega128RFA1 Manuel d'utilisateur Page 331

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331
8266A-MCU Wireless-12/09
ATmega128RFA1
Figure 22-1. SPI Block Diagram
(1)
SPI2X
SPI2X
DIVIDER
/2/4/8/16/32/64/128
Note: 1. Refer to Figure 1-1 on page 2 and Table 14-3 on page 193 for SPI pin placement.
Figure 22-2. SPI Master-slave Interconnection
SHIFT
ENABLE
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 character must be read from the SPI Data Register before the next character
has been completely shifted in. Otherwise, the first byte is lost. In SPI Slave mode, the
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