at75c220 ATMEL Corporation, at75c220 Datasheet - Page 121

• Manufacturer Part Number: at75c220
• Description: Smart Internet Appliance Processor Siap
• Manufacturer: ATMEL Corporation

SPI: Serial Peripheral Interface
The AT75C220 integrates a serial peripheral interface
(SPI) that provides communication with external devices in
Figure 27. Serial Peripheral Interface Block Diagram
Table 26. SPI Interface Pins
Note:
Pin Name
MISO
MOSI
SPCK
NPCSS
NPCS[3:1]
After a hardware reset, the SPI pins NPCS[3:1] are not enabled by default and must be programmed via the PIOA controller.
Peripheral Chip Selects
Peripheral Chip Select/
Master In/Slave Out
Master Out/Slave In
APB
Description
Slave Select
Serial Clock
ACLK
ACLK/32
Serial Peripheral Interface
Interrupt Controller
Master
Master
Master
Master
Master
Master
Mode
Slave
Slave
Slave
Slave
Advanced
INT
master or slave mode. Typically it is used to connect to
external processors or serial Flash.
NPCSS
NPCS1
NPCS2
NPCS3
SPCK
MISO
MOSI
Function
Serial data input to SPI
Serial data output from SPI
Serial data output from SPI
Serial data input to SPI
Clock output from SPI
Clock input to SPI
Output: Selects peripheral
Input: Low causes mode fault
Input: Chip select for SPI
Extra selects
NPCSS
NPCS1
NPCS2
NPCS3
SPCK
MISO
MOSI
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