參數(shù)資料
型號: C8051F000-GQ
廠商: Silicon Laboratories Inc
文件頁數(shù): 171/171頁
文件大小: 0K
描述: IC 8051 MCU 32K FLASH 64TQFP
產品培訓模塊: Serial Communication Overview
標準包裝: 160
系列: C8051F00x
核心處理器: 8051
芯體尺寸: 8-位
速度: 20MHz
連通性: SMBus(2 線/I²C),SPI,UART/USART
外圍設備: 欠壓檢測/復位,POR,PWM,溫度傳感器,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 32KB(32K x 8)
程序存儲器類型: 閃存
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
數(shù)據(jù)轉換器: A/D 8x12b,D/A 2x12b
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 64-TQFP
包裝: 托盤
產品目錄頁面: 621 (CN2011-ZH PDF)
其它名稱: 336-1184
C8051F000/1/2/5/6/7
C8051F010/1/2/5/6/7
14. OSCILLATOR
Each MCU includes an internal oscillator and an external oscillator drive circuit, either of which can generate the
system clock. The MCUs boot from the internal oscillator after any reset. The internal oscillator starts up instantly.
It can be enabled/disabled and its frequency can be changed using the Internal Oscillator Control Register
(OSCICN) as shown in Figure 14.2. The internal oscillator’s electrical specifications are given in Table 14.1.
Both oscillators are disabled when the /RST pin is held low. The MCUs can run from the internal oscillator or
external oscillator, and switch between the two at will using the CLKSL bit in the OSCICN Register. The external
oscillator requires an external resonator, parallel-mode crystal, capacitor, or RC network connected to the
XTAL1/XTAL2 pins (see Figure 14.1). The oscillator circuit must be configured for one of these sources in the
OSCXCN register. An external CMOS clock can also provide the system clock via overdriving the XTAL1 pin.
The XTAL1 and XTAL2 pins are 3.6V (not 5V) tolerant. The external oscillator can be left enabled and running
even when the MCU has switched to using the internal oscillator.
Figure 14.1. Oscillator Diagram
OSC
Internal Clock
Generator
SYSCLK
Input
Circuit
OSCXCN
EN
X
T
LV
LD
XO
SC
MD2
XO
SC
MD1
XO
SC
MD0
XF
CN
2
XF
CN
1
XF
CN
0
OSCICN
M
SCL
K
E
IF
R
D
Y
CL
KS
L
IO
SC
E
N
IFC
N
1
IFC
N
0
XTAL1
XTAL2
opt. 1
opt. 2
opt. 4
opt. 3
XTAL1
XTAL2
XTAL1
AV+
AGND
VDD
AV+
99
Rev. 1.7
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