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| 型號(hào)： | MC68HC912BL16CFU8 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | QFP-64 |
| 文件頁(yè)數(shù)： | 13/128頁(yè) |
| 文件大?。?/td> | 3326K |
| 代理商： | MC68HC912BL16CFU8 |
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MC68HC912BL16TS/D
11
Figure 4 Common Crystal Connections
Figure 5 External Oscillator Connections
XTAL is the crystal output. The XTAL pin must be left unterminated when an external CMOS compatible
clock input is connected to the EXTAL pin. The XTAL output is normally intended to drive only a crystal.
The XTAL output can be buffered with a high-impedance buffer to drive the EXTAL input of another de-
vice.
In all cases take extra care in the circuit board layout around the oscillator pins. Load capacitances
shown in the oscillator circuits include all stray layout capacitances. Refer to Figure 4 and Figure 5 for
diagrams of oscillator circuits.
3.3.2 E-Clock Output (ECLK)
ECLK is the output connection for the internal bus clock and is used to demultiplex the address and data
and is used as a timing reference. ECLK frequency is equal to 1/2 the crystal frequency out of reset.
In normal single-chip mode the E-clock output is off at reset to reduce the effects of RFI but can be
turned on if necessary.
In special single-chip mode the E-clock output is on at reset but can be turned off.
In special peripheral mode the E clock is an input to the MCU.
All clocks, including the E-clock, are halted when the MCU is in STOP mode. It is possible to configure
the MCU to interface to slow external memory. ECLK can be stretched for such accesses.
10 M
MCU
C
EXTAL
XTAL
2 x E
CRYSTAL
COMMON XTAL CONN
NC
MCU
EXTAL
XTAL
2 x E
CMOS-COMPATIBLE
EXT EXTAL CONN
EXTERNAL OSCILLATOR
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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