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參數(shù)資料
| 型號(hào)： | MC68HC05E0FN |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁(yè)數(shù)： | 10/96頁(yè) |
| 文件大小： | 890K |
| 代理商： | MC68HC05E0FN |
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2
MOTOROLA
2-2
MC68HC05E0
FUNCTIONAL PIN DESCRIPTION
recommended capacitance and feedback resistance values. The manufacturer of the particular
ceramic resonator being considered should be consulted for specic information.
2.2.3
External Clock
An external clock should be applied to the OSC1 input with the OSC2 pin not connected, as shown
in Figure 2-1(d). The tOXOV or tILCH specications do not apply when using an external clock
input. The equivalent specication of the external clock source should be used in lieu of tOXOV or
tILCH.
2.3
RESET
This active low input-only pin is used to reset the MCU. Applying a logic zero to this pin forces the
device to a known start-up state. An external RC-circuit can be connected to this pin to generate
a power-on reset (POR). In this case, the time constant must be chosen high enough (minimum
100 ms) to allow the oscillator circuit to stabilise. This input has an internal pull-up resistor and an
internal Schmitt trigger to improve noise immunity.
2.4
Port A (PA0 - PA7)
Port A is comprised of eight bidirectional pins (PA0 to PA7). The direction and state of each pin is
software programmable, and each pin can drive one LED load. All pins are congured as inputs
during power-on or reset.
2.5
Port B (PB0 - PB7)
Port B is comprised of eight bidirectional pins (PB0 to PB7). The direction and state of each pin is
software programmable. All pins are congured as inputs during power-on or reset.
2.6
Port C (PC0 - PC7)
Port C is comprised of eight bidirectional pins (PC0 to PC7). The direction and state of each pin
is software programmable. In addition, each input can be congured to support a wake-up function
and trigger a processor interrupt. All pins are congured as inputs during power-on or reset.
18
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