参数资料
型号: MC68HC08QT2VDW
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, PDSO8
封装: EIAJ, SOIC-8
文件页数: 174/178页
文件大小: 2311K
代理商: MC68HC08QT2VDW
Registers
MC68HC08QY/QT Family Data Sheet, Rev. 1
Freescale Semiconductor
95
ECFS1:ECFS0 — External Crystal Frequency Select Bits
These read/write bits enable the specific amplifier for the crystal frequency range. Refer to oscillator
characteristics table in the Electricals section for information on maximum external clock frequency
versus supply voltage.
ECGON — External Clock Generator On Bit
This read/write bit enables the OSC1 pin as the clock input to the MCU, so that the switching process
can be initiated. This bit is cleared by reset. This bit is ignored in monitor mode with the internal
oscillator bypassed.
1 = External clock enabled
0 = External clock disabled
ECGST — External Clock Status Bit
This read-only bit indicates whether an external clock source is engaged to drive the system clock.
1 = An external clock source engaged
0 = An external clock source disengaged
11.8.2 Oscillator Trim Register (OSCTRIM)
TRIM7–TRIM0 — Internal Oscillator Trim Factor Bits
These read/write bits change the internal capacitance used by the internal oscillator. By measuring the
period of the internal clock and adjusting this factor accordingly, the frequency of the internal clock can
be fine tuned. Increasing (decreasing) this factor by one increases (decreases) the period by
approximately 0.2% of the untrimmed oscillator period. The oscillator period is based on the oscillator
frequency selected by the ICFS bits in OSCSC.
ECFS1
ECFS0
External Crystal Frequency
0
8 MHz – 32 MHz
0
1
1 MHz – 8 MHz
1
0
32 kHz – 100 kHz
11
Reserved
Bit 7
654321
Bit 0
Read:
TRIM7
TRIM6
TRIM5
TRIM4
TRIM3
TRIM2
TRIM1
TRIM0
Write:
Reset:
10000000
Figure 11-5. Oscillator Trim Register (OSCTRIM)
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