C8051F042-GQ Silicon Laboratories Inc, C8051F042-GQ Datasheet - Page 263

• Manufacturer Part Number: C8051F042-GQ
• Description: IC 8051 MCU 64K FLASH 100TQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F04xr

Specifications of C8051F042-GQ

• Program Memory Type: FLASH
• Program Memory Size: 64KB (64K x 8)
• Package / Case: 100-TQFP, 100-VQFP
• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: CAN, EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 64
• Ram Size: 4.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x8b, 13x10b; D/A 2x10b, 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: C8051F0x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 4.25 KB
• Interface Type: CAN/SMBus/SPI/UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 64
• Number Of Timers: 5
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F040DK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8-ch x 8-bit or 13-ch x 12-bit
• On-chip Dac: 2-ch x 12-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 336-1205 - DEV KIT FOR F040/F041/F042/F043
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1207

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