C8051F040DK Silicon Laboratories Inc, C8051F040DK Datasheet - Page 263

• Manufacturer Part Number: C8051F040DK
• Description: DEV KIT FOR F040/F041/F042/F043
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F040DK

• Contents: Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
• Processor To Be Evaluated: C8051F04x
• Interface Type: USB
• Silicon Manufacturer: Silicon Labs
• Core Architecture: 8051
• Silicon Core Number: C8051F040
• Silicon Family Name: C8051F04x
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: Silicon Laboratories C8051 F040, 041, 042, 043 MCUs
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1205

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