C8051F305-GS Silicon Laboratories Inc, C8051F305-GS Datasheet - Page 100

• Manufacturer Part Number: C8051F305-GS
• Description: IC 8051 MCU 2K FLASH 14-SOIC
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F30xr

Specifications of C8051F305-GS

• Program Memory Type: FLASH
• Program Memory Size: 2KB (2K x 8)
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Processor Series: C8051F3x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: I2C/SMBus/UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 8
• Number Of Timers: 3
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F300DK
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 770-1006 - ISP 4PORT FOR SILABS C8051F MCU336-1444 - ADAPTER PROGRAM TOOLSTICK F300
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1540-5

C8051F300/1/2/3/4/5
100
Bit7:
Bits6–4: XOSCMD2-0: External Oscillator Mode Bits.
Bit3:
Bits2–0: XFCN2-0: External Oscillator Frequency Control Bits.
CRYSTAL MODE (Circuit from Figure 11.1, Option 1; XOSCMD = 11x)
RC MODE (Circuit from Figure 11.1, Option 2; XOSCMD = 10x)
C MODE (Circuit from Figure 11.1, Option 3; XOSCMD = 10x)
XTLVLD XOSCMD2 XOSCMD1 XOSCMD0
Bit7
R
XTLVLD: Crystal Oscillator Valid Flag.
(Read only when XOSCMD = 11x.)
0: Crystal Oscillator is unused or not yet stable.
1: Crystal Oscillator is running and stable.
00x: External Oscillator circuit off.
010: External CMOS Clock Mode.
011: External CMOS Clock Mode with divide by 2 stage.
100: RC Oscillator Mode with divide by 2 stage.
101: Capacitor Oscillator Mode with divide by 2 stage.
110: Crystal Oscillator Mode.
111: Crystal Oscillator Mode with divide by 2 stage.
RESERVED. Read = 0, Write = don't care.
000-111: See table below:
Choose XFCN value to match crystal frequency.
Choose XFCN value to match frequency range:
f = 1.23(10
f = frequency of oscillation in MHz
C = capacitor value in pF
R = Pull-up resistor value in k
Choose K Factor (KF) for the oscillation frequency desired:
f = KF / (C x V
f = frequency of oscillation in MHz
C = capacitor value the XTAL2 pin in pF
V
DD
XFCN
SFR Definition 11.3. OSCXCN: External Oscillator Control
000
001
010
100
101
011
110
111
= Power Supply on MCU in volts
R/W
Bit6
3
) / (R x C), where
Crystal (XOSCMD = 11x)
DD
225 kHz  f 590 kHz
590 kHz  f 1.5 MHz
10 MHz  f 30 MHz
84 kHz  f 225 kHz
1.5 MHz  f 4 MHz
4 MHz  f 10 MHz
32 kHz f 84 kHz
R/W
), where
Bit5
f  32 kHz
R/W
Bit4
Rev. 2.9
Bit3
—
100 kHz f 200 kHz
200 kHz f 400 kHz
400 kHz f 800 kHz
800 kHz f 1.6 MHz
1.6 MHz f 3.2 MHz
R
RC (XOSCMD = 10x)
50 kHz f 100 kHz
25 kHz f 50 kHz
f 25 kHz
XFCN2
R/W
Bit2
XFCN1
R/W
Bit1
C (XOSCMD = 10x)
K Factor = 1590
K Factor = 0.87
K Factor = 180
K Factor = 664
K Factor = 2.6
K Factor = 7.7
K Factor = 22
K Factor = 65
XFCN0
R/W
Bit0
SFR Address:
00000000
Reset Value
0xB1