參數(shù)資料
型號: C8051F006R
廠商: Silicon Laboratories Inc
文件頁數(shù): 4/171頁
文件大?。?/td> 0K
描述: IC 8051 MCU 32K FLASH 48TQFP
標(biāo)準(zhǔn)包裝: 1
系列: C8051F00x
核心處理器: 8051
芯體尺寸: 8-位
速度: 25MHz
連通性: SMBus(2 線/I²C),SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,溫度傳感器,WDT
輸入/輸出數(shù): 16
程序存儲(chǔ)器容量: 32KB(32K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 2.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x12b,D/A 2x12b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 48-TQFP
包裝: 剪切帶 (CT)
其它名稱: 336-1004-1
C8051F000/1/2/5/6/7
C8051F010/1/2/5/6/7
Figure 14.3. OSCXCN: External Oscillator Control Register
R
R/W
Reset Value
XTLVLD
XOSCMD2
XOSCMD1
XOSCMD0
-
XFCN2
XFCN1
XFCN0
00110000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
SFR Address:
0xB1
Bit7:
XTLVLD: Crystal Oscillator Valid Flag
(Valid only when XOSCMD = 1xx.)
0: Crystal Oscillator is unused or not yet stable
1: Crystal Oscillator is running and stable (should read 1ms after Crystal Oscillator is
enabled to avoid transient condition).
Bits6-4: XOSCMD2-0: External Oscillator Mode Bits
00x: Off. XTAL1 pin is grounded internally.
010: System Clock from External CMOS Clock on XTAL1 pin.
011: System Clock from External CMOS Clock on XTAL1 pin divided by 2.
10x: RC/C Oscillator Mode with divide by 2 stage.
110: Crystal Oscillator Mode
111: Crystal Oscillator Mode with divide by 2 stage.
Bit3:
RESERVED. Read = undefined, Write = don’t care
Bits2-0: XFCN2-0: External Oscillator Frequency Control Bits
000-111: see table below
XFCN
Crystal (XOSCMD =
11x)
RC (XOSCMD = 10x)
C (XOSCMD = 10x)
000
K Factor = 0.44
f
12.5kHz
f
25kHz
001
K Factor = 1.4
12.5kHz < f
30.3kHz
25kHz < f
50kHz
010
K Factor = 4.4
30.35kHz < f
93.8kHz
50kHz < f
100kHz
011
K Factor = 13
93.8kHz < f
267kHz
100kHz < f
200kHz
100
K Factor = 38
267kHz < f
722kHz
200kHz < f
400kHz
101
K Factor = 100
722kHz < f
2.23MHz
400kHz < f
800kHz
110
K Factor = 420
2.23MHz < f
6.74MHz
800kHz < f
1.6MHz
111
f > 6.74MHz
K Factor = 1400
1.6MHz < f
3.2MHz
CRYSTAL MODE (Circuit from Figure 14.1, Option 1; XOSCMD = 11x)
Choose XFCN value to match the crystal or ceramic resonator frequency.
RC MODE (Circuit from Figure 14.1, Option 2; XOSCMD = 10x)
Choose oscillation frequency range where:
3) / (R * C), where
f = 1.23(10
f = frequency of oscillation in MHz
C = capacitor value in pF
R = Pull-up resistor value in k
C MODE (Circuit from Figure 14.1, Option 3; XOSCMD = 10x)
Choose K Factor (KF) for the oscillation frequency desired:
f = KF / (C * AV+), where
f = frequency of oscillation in MHz
C = capacitor value on XTAL1, XTAL2 pins in pF
AV+ = Analog Power Supply on MCU in volts
101
Rev. 1.7
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