参数资料
型号: C8051F005-TB
厂商: Silicon Laboratories Inc
文件页数: 171/171页
文件大小: 0K
描述: BOARD PROTOTYPING W/C8051F005
标准包装: 1
类型: MCU
适用于相关产品: C8051F005
所含物品:
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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