C8051F581-IMR Silicon Labs, C8051F581-IMR Datasheet - Page 279

• Manufacturer Part Number: C8051F581-IMR
• Description: 8-bit Microcontrollers - MCU 50MIPS 128kB 8kB SPI
• Manufacturer: Silicon Labs

Specifications of C8051F581-IMR

• Rohs: yes
• Core: 8051
• Processor Series: C8051
• Data Bus Width: 8 bit

SFR Definition 26.3. SPI0CKR: SPI0 Clock Rate
SFR Address = 0xA2; SFR Page = 0x00
SFR Definition 26.4. SPI0DAT: SPI0 Data
SFR Address = 0xA3; SFR Page = 0x00
Name
Reset
Name
Reset
Bit
7:0
Bit
7:0
Type
Type
Bit
Bit
SPI0DAT[7:0] SPI0 Transmit and Receive Data.
SCR[7:0]
Name
Name
7
0
7
0
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.
for 0 <= SPI0CKR <= 255
Example: If SYSCLK = 2 MHz and SPI0CKR = 0x04,
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.
f SCK
f SCK
6
0
6
0
=
=
----------------------------- -
2
--------------------------------------------------------------- -
2
2000000
x
x
5
0

5
0

4
SPI0CKR[7:0]
+
SYSCLK
1

Rev. 1.2
SPI0DAT[7:0]
4
0
4
0
SCR[7:0]
f SCK
+
R/W
R/W
1

Function
Function
=
3
0
3
0
200 kHz
C8051F58x/F59x
2
0
2
0
1
0
1
0
0
0
0
0
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