C8051F047R Silicon Labs, C8051F047R Datasheet - Page 263

• Manufacturer Part Number: C8051F047R
• Description: 8-bit Microcontrollers - MCU 25 MIPS 32KB 10ADC
• Manufacturer: Silicon Labs

Specifications of C8051F047R

• Product Category: 8-bit Microcontrollers - MCU
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 25 MHz
• Program Memory Size: 32 KB
• Data Ram Size: 4.25 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: 13
• Data Rom Size: 64 KB
• Interface Type: CAN, 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: 2.7 V

Bits 7-0: SCR7-SCR0: SPI0 Clock Rate
Example: If SYSCLK = 2 MHz and SPI0CKR = 0x04,
SCR7
R/W
Bit7
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.
f
for 0 <= SPI0CKR <= 255
f
SCK
f
SCK
SCK
SCR6
R/W
Bit6
=
=
=
------------------------------------------------ -
2
200kHz
------------------------- -
2

2000000
SFR Definition 20.3. SPI0CKR: SPI0 Clock Rate



SPI0CKR
SCR5
SYSCLK
4
R/W
Bit5
+
1

SCR4
+
R/W
Bit4
1

SCR3
Rev. 1.5
R/W
Bit3
C8051F040/1/2/3/4/5/6/7
SCR2
R/W
Bit2
SCR1
R/W
Bit1
SFR Address:
SCR0
SFR Page:
R/W
Bit0
0x9D
0
00000000
Reset Value
263