参数资料
型号: MC68HC08QY4CDWE
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16
封装: 1.27 MM PITCH, LEAD FREE, PLASTIC, MS-013AA, SOIC-16
文件页数: 171/178页
文件大小: 2311K
代理商: MC68HC08QY4CDWE
Oscillator Module (OSC)
MC68HC08QY/QT Family Data Sheet, Rev. 1
92
Freescale Semiconductor
11.3.5 RC Oscillator
The RC oscillator circuit is designed for use with an external resistor (REXT) to provide a clock source with
a tolerance within 25% of the expected frequency. See Figure 11-3.
The capacitor (C) for the RC oscillator is internal to the MCU. The REXT value must have a tolerance of
1% or less to minimize its effect on the frequency.
In this configuration, the OSC2 pin can be used as general-purpose input/output (I/O) port pins or other
alternative pin function. The OSC2EN bit can be set to enable the OSC2 output function on the pin.
Enabling the OSC2 output can affect the external RC oscillator frequency, fRCCLK.
Figure 11-3. RC Oscillator External Connections
11.4 Interrupts
There are no interrupts associated with the OSC module.
11.5 Low-Power Modes
The WAIT and STOP instructions put the MCU in low power-consumption standby modes.
11.5.1 Wait Mode
The OSC module remains active in wait mode.
11.5.2 Stop Mode
The OSC module can be configured to remain active in stop mode by setting OSCENINSTOP located in
a configuration register.
MCU
REXT
OSC1
EXTERNAL RC
OSCILLATOR
EN
RCCLK
÷ 2
BUSCLKX2
BUSCLKX4
VDD
1
0
OSC2EN
OSC2 — AVAILABLE FOR ALTERNATIVE PIN FUNCTION
See the electricals section for component value.
0
1
INTCLK
OSCOPT = EXTERNAL RC SELECTED
SIMOSCEN (INTERNAL SIGNAL) OR
OSCENINSTOP (BIT LOCATED IN
CONFIGURATION REGISTER)
ALTERNATIVE
PIN FUNTION
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