C8051F131R Silicon Labs, C8051F131R Datasheet - Page 282

• Manufacturer Part Number: C8051F131R
• Description: 8-bit Microcontrollers - MCU 128kB 100MIPS 8448B RAM
• Manufacturer: Silicon Labs

Specifications of C8051F131R

• Product Category: 8-bit Microcontrollers - MCU
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 100 MHz
• Program Memory Size: 128 KB
• Data Ram Size: 8.25 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 2.7 V to 3.6 V
• Package / Case: TQFP-64
• Mounting Style: SMD/SMT
• A/d Bit Size: 10 bit
• A/d Channels Available: 9
• Data Rom Size: 64 KB
• Interface Type: I2C, SMBus, SPI, UART
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 32
• Number Of Timers: 16 bit
• Processor Series: C8051
• Program Memory Type: Flash
• Factory Pack Quantity: 500
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 3 V

C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
282
Bits 7–0: SPI0DAT: SPI0 Transmit and Receive Data.
Bits 7–0: SCR7–SCR0: SPI0 Clock Rate.
Example: If SYSCLK = 2 MHz and SPI0CKR = 0x04,
f
SCK
SCR7
f
R/W
Bit7
SCK
R/W
Bit7
=
=
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.
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 version 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
200kHz
------------------------- -
2
2000000
SCR6

R/W
Bit6
R/W
Bit6

4
+
SFR Definition 20.3. SPI0CKR: SPI0 Clock Rate
1

SFR Definition 20.4. SPI0DAT: SPI0 Data
SCR5
R/W
Bit5
R/W
Bit5
f
SCK
SCR4
R/W
Bit4
R/W
Bit4
=
---------------------------------------------- -
2

Rev. 1.4
SCR3

R/W
Bit3
R/W
Bit3
SPI0CKR
SYSCLK
SCR2
R/W
Bit2
R/W
Bit2
+
1

SCR1
R/W
Bit1
R/W
Bit1
SFR Address:
SFR Address:
SFR Page:
SFR Page:
SCR0
R/W
Bit0
R/W
Bit0
0x9B
0
00000000
0x9D
0
Reset Value
00000000
Reset Value