Si1000/1/2/3/4/5
SFR Definition 26.9. SPI0CKR: SPI0 Clock Rate
Bit
Name
Type
Reset
0
0
0
0
7
6
5
4
SCR[7:0]
R/W
3
2
1
0
0
0
0
0
SFR Page = 0x0; SFR Address = 0xA2
Bit
Name
7:0
SCR[7:0]
Function
SPI0 Clock Rate.
These bits determine the frequency of the SCK output when the SPI0 module is
configured for master mode operation. The SCK clock frequency is a divided ver-
sion of the system clock, and is given in the following equation, where
SYSCLK
is
the system clock frequency and
SPI0CKR
is the 8-bit value held in the SPI0CKR
register.
SYSCLK
f
SCK
= ----------------------------------------------------------
-
2
SPI0CKR[7:0] + 1
for 0 <= SPI0CKR <= 255
Example: If SYSCLK = 2 MHz and SPI0CKR = 0x04,
2000000 -
f
SCK
= -------------------------
2
4 + 1
f
SCK
= 200kHz
SFR Definition 26.10. SPI0DAT: SPI0 Data
Bit
Name
Type
Reset
0
0
0
0
7
6
5
4
3
2
1
0
SPI0DAT[7:0]
R/W
0
0
0
0
SFR Page = 0x0; SFR Address = 0xA3
Bit
Name
7:0
SPI0DAT[7:0]
SPI0 Transmit and Receive Data.
Function
The SPI0DAT register is used to transmit and receive SPI0 data. Writing data to
SPI0DAT places the data into the transmit buffer and initiates a transfer when in
Master Mode. A read of SPI0DAT returns the contents of the receive buffer.
326
Rev. 1.0
SILABS [ SILICON LABORATORIES ]
