Using the AT89RFD-08 Board
2-12
AT89RFD-08 Hardware User Guide
4382E–MP3–05/06
2.4.3
SPI
The AT89C51SND2C is a micro-controller with an on-chip full duplex SPI interface,
master or slave.
A 6-pin male connector assumes the SPI bus connections.
Figure 2-11.
SPI 6-pin Connector
The SPI 6-pin connector also provides to the user Vcc and Gnd.
Figure 2-12.
SPI 6-pin Connections
2.4.4
TWI
The AT89C51SND2C provides an on-chip TWI interface, master or slave. The SDA and
SCL signals provided for TWI communication are wired to the expansion connector.
SPI Connector front view
pin 1
MOSI
pin 2
SS
pin 3
Gnd
pin 5
pin 4
1
5
6
2
3
4
pin 6
Vcc
MISO
SCK