C8051F321-GMR Silicon Laboratories Inc, C8051F321-GMR Datasheet - Page 124

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

Specifications of C8051F321-GMR

• 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
• Processor Series: C8051F3x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 2.25 KB
• Interface Type: I2C, SMBus, SPI, UART, USB
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 21
• Number Of Timers: 4
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F320DK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 13 Channel / 10 bit, 7 Channel
• Package: 28MLP
• Device Core: 8051
• Family Name: C8051F321
• Maximum Speed: 25 MHz
• Operating Supply Voltage: 3.3 V
• For Use With: 336-1480 - DAUGHTER CARD TOOLSTCK C8051F321336-1449 - ADAPTER PROGRAM TOOLSTICK F321336-1260 - DEV KIT FOR C8051F320/F321
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

C8051F320/1
124
Bit 7:
Bits6–4: USBCLK2–0: USB Clock Select
Bits3–2: Unused. Read = 00b; Write = don’t care.
Bits1–0: CLKSL1–0: System Clock Select
R/W
Bit7
-
USB Clock
Internal Oscillator
USB Clock
External Oscillator
Unused. Read = 0b; Write = don’t care.
These bits select the clock supplied to USB0. When operating USB0 in full-speed mode, the
selected clock should be 48 MHz. When operating USB0 in low-speed mode, the selected
clock should be 6 MHz.
These bits select the system clock source.
R/W
Bit6
Clock Signal
Clock Signal
Table 13.2. Typical USB Low Speed Clock Settings
USBCLK
CLKSL
000
001
010
011
100
101
110
111
00
01
10
11
SFR Definition 13.5. CLKSEL: Clock Select
USBCLK
R/W
Bit5
Internal Oscillator/2
Divide by 1
External Oscillator/4
Crystal Oscillator Mode
24 MHz Crystal
R/W
Bit4
Input Source Selection
Input Source Selection
Internal Oscillator (as determined by the
External Oscillator
Internal Oscillator
IFCN bits in register OSCICN)
Rev. 1.4
R/W
Bit3
External Oscillator/2
4x Clock Multiplier/2
External Oscillator/3
External Oscillator/4
Internal Oscillator/2
-
4x Clock Multiplier
External Oscillator
External Oscillator
Selected Clock
Selected Clock
RESERVED
RESERVED
RESERVED
R/W
Bit2
-
USBCLK = 001b
IFCN = 11b
USBCLK = 101b
XOSCMD = 110b
XFCN = 111b
Register Bit Settings
Register Bit Settings
R/W
Bit1
CLKSL
R/W
Bit0
SFR Address
00000000
Reset Value
0xA9