參數(shù)資料
型號: C8051F206
廠商: Silicon Laboratories Inc
文件頁數(shù): 146/146頁
文件大?。?/td> 0K
描述: IC 8051 MCU 8K FLASH 48TQFP
標(biāo)準(zhǔn)包裝: 250
系列: C8051F2xx
核心處理器: 8051
芯體尺寸: 8-位
速度: 25MHz
連通性: SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,WDT
輸入/輸出數(shù): 32
程序存儲(chǔ)器容量: 8KB(8K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 32x12b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 48-TQFP
包裝: 托盤
C8051F2xx
Rev. 1.6
99
SFR Definition 13.2. OSCXCN: External Oscillator Control
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
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
CRYSTAL MODE (Circuit from Figure 13.1, Option 1; XOSCMD = 11x)
Choose XFCN value to match the crystal frequency.
RC MODE (Circuit from Figure 13.1, Option 2; XOSCMD = 10x)
Choose oscillation frequency range where:
f = 1.23(103) / (R x C), where
f = frequency of oscillation in MHz
C = capacitor value in pF
R = Pull-up resistor value in k
C MODE (Circuit from Figure 13.1, Option 3; XOSCMD = 10x)
Choose K Factor (KF) for the oscillation frequency desired:
f = KF / (C x AV+), where
f = frequency of oscillation in MHz
C = capacitor value on XTAL1, XTAL2 pins in pF
VDD = Power supply voltage on MCU in volts
R
R/W
Reset Value
XTLVLD XOSCMD2 XOSCMD1 XOSCMD0
-
XFCN2
XFCN1
XFCN0
00110000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
SFR Address:
0xB1
XFCN
Crystal (XOSCMD = 11x)
RC (XOSCMD = 10x)
C (XOSCMD = 10x)
000
f
12.5 kHz
f
25 kHz
K Factor = 0.44
001
12.5 kHz < f
30.3 kHz
25 kHz < f
50 kHz
K Factor = 1.4
010
30.35 kHz < f
93.8 kHz
50 kHz < f
100 kHz
K Factor = 4.4
011
93.8 kHz < f
26 7kHz
100 kHz < f
200 kHz
K Factor = 13
100
267 kHz < f
722 kHz
200 kHz < f
400 kHz
K Factor = 38
101
722 kHz < f
2.23 MHz
400 kHz < f
800 kHz
K Factor = 100
110
2.23 MHz < f
6.74 MHz
800 kHz < f
1.6 MHz
K Factor = 420
111
f > 6.74 MHz
1.6 MHz < f
3.2 MHz
K Factor = 1400
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