C8051F321 Silicon Laboratories Inc, C8051F321 Datasheet - Page 212

• Manufacturer Part Number: C8051F321
• Description: IC 8051 MCU 16K FLASH 28MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F321

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 21
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

C8051F320/1
212
Bits 7-0: SCR7-SCR0: SPI0 Clock Rate.
Example: If SYSCLK = 2 MHz and SPI0CKR = 0x04,
f
SCK
f
SCR7
SCK
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.
for 0 <= SPI0CKR <= 255
200kHz
f
SCK
------------------------- -
2
2000000
×
SCR6
R/W
Bit6
(
=
4
+
------------------------------------------------ -
2
×
1
Figure 18.10. SPI0CKR: SPI0 Clock Rate Register
)
(
SPI0CKR
SCR5
SYSCLK
R/W
Bit5
SCR4
+
R/W
Bit4
1
)
Rev. 1.1
SCR3
R/W
Bit3
SCR2
R/W
Bit2
SCR1
R/W
Bit1
SFR Address: 0xA2
SCR0
R/W
Bit0
00000000
Reset Value