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AT90SCR100 Datasheet(PDF) 281 Page - ATMEL Corporation

Part # AT90SCR100
Description  8-bit Microcontroller for Smart Card Readers
PDF  433 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90SCR100 Datasheet(HTML) 281 Page - ATMEL Corporation

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TPR0327AY–SMS–30Jan09
AT90SCR100
21.2.2
SPI Controller Configured as a Slave
21.2.2.1
One byte sending using shift register (without DPRAM)
If the DPRAM is not activated (HSSPICFG.DPRAM bit cleared), the software may update the
contents of the HSSPI Transmit Data Register, SPITDR, that will be shifted out by incoming
clock pulses on the clock pin. As soon as the byte has been completely shifted, the Byte transfer
Done flag (HSSPIIR.BTD) is set. If global interrupt and the HSSPIIER.BTDIE bit have been previ-
ously set, an interrupt is generated.
At this stage, the Slave can read the HSSPIRDR register to retrieve the byte sent by the other
device. The HSSPICFG.BTD flag must then be cleared by software.
Figure 21-5.
HSSPI - Slave without DPRAM activated
Clear BTD (HSSPIIR)
(mandatory if IRQ mode)
Data to send?
YES
NO
Wait SPICKRDY
(HSSPISR)
Write data to send
into HSSPITDR
Configure CPOL, CPHA,
MSTR=0,
SPIEN, DPRAM=0,
BTDIE (if IRQ mode)
Wait BTD
(HSSPIIR)
Data to receive?
Wait BTD
(HSSPIIR)
Read data from HSSPIRDR
NO
YES



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