參數(shù)資料
型號: C8051F236-GQ
廠商: Silicon Laboratories Inc
文件頁數(shù): 144/146頁
文件大?。?/td> 0K
描述: IC 8051 MCU 8K FLASH 48TQFP
產(chǎn)品培訓模塊: Serial Communication Overview
標準包裝: 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
外圍設備: 欠壓檢測/復位,POR,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 8KB(8K x 8)
程序存儲器類型: 閃存
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
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
產(chǎn)品目錄頁面: 623 (CN2011-ZH PDF)
其它名稱: 336-1244
C8051F2xx
Rev. 1.6
97
13. Oscillator
The MCU includes an internal oscillator and an external oscillator drive circuit, either of which can generate
the system clock. The MCU boots from the internal oscillator after any reset. This internal oscillator can
be enabled/disabled and its frequency can be set using the Internal Oscillator Control Register (OSCICN)
as shown in SFR Definition 13.1. The internal oscillator's electrical specifications are given in Table 13.1.
Both oscillators are disabled when the RST pin is held low. The MCU can run from the internal oscillator
permanently, or it can switch to the external oscillator if desired using CLKSL bit in the OSCICN Register.
The external oscillator requires an external resonator, crystal, capacitor, or RC network connected to the
XTAL1/XTAL2 pins (see Figure 13.1). 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 by driving the XTAL1
pin. The XTAL1 and XTAL2 pins are NOT 5 V tolerant.
Figure 13.1. Oscillator Diagram
XTAL1
XTAL2
OSC
Internal Clock
Generator
SYSCLK
Input
Circuit
OSCXCN
EN
opt. 1
opt. 2
opt. 4
VDD
opt. 3
XTAL1
XTAL2
XTAL1
XTLVLD
XOSCMD2
XOSCMD1
XOSCMD0
XF
CN2
XF
CN1
XF
CN0
OSCICN
MSCLKE
IF
RDY
CLKSL
IOSCEN
IF
CN1
IF
CN0
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