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參數(shù)資料
| 型號： | MC68HC05L25PB |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP52 |
| 封裝： | TQFP-52 |
| 文件頁數(shù)： | 66/152頁 |
| 文件大小： | 897K |
| 代理商： | MC68HC05L25PB |
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General Description
MC68HC05L25 Data Sheet, Rev. 3.1
20
Freescale Semiconductor
1.5.1 VDD and VSS
Power is supplied to the MCU through VDD and VSS. VDD is the positive supply, and VSS is ground. The
MCU operates from a single power supply.
Very fast signal transitions occur on the MCU pins. The short rise and fall times place very high
short-duration current demands on the power supply. To prevent noise problems, special care should be
taken to provide good power supply bypassing at the MCU by using bypass capacitors with good
high-frequency characteristics that are positioned as close to the MCU as possible. Bypassing
requirements vary, depending on how heavily the MCU pins are loaded.
1.5.2 VLCD
This pin provides an offset to the LCD driver bias for adjusting the contrast of LCD. See Chapter 11 LCD
Driver for additional information.
1.5.3 RESET
This pin can be used as an input to reset the MCU to a known startup state by pulling it to the low state.
The RESET pin contains a steering diode to discharge any voltage on the pin to VDD when the power is
removed. The RESET pin contains an internal Schmitt trigger to improve its noise immunity as an input.
Refer to Chapter 5 Resets.
1.5.4 OSC1 and OSC2
The OSC1 and OSC2 pins are the connections for the 2-pin on-chip oscillator. The OSC1 and OSC2 pins
can accept these sets of components:
1.
A crystal or ceramic resonator as shown in Figure 1-4(a)
2.
An external clock signal as shown in Figure 1-4(b)
Figure 1-4. Oscillator Connections
The frequency, fOSC, of the oscillator or external clock source is divided by two to produce the internal
operating frequency, fOP, by default.
MCU
CO2
(a) Crystal Connections
OSC1
OSC2
CO1
R
OF
UNCONNECTED
EXTERNAL CLOCK
(b) External Clock
Source Connection
OSC1
OSC2
MCU
4 MHz (TYPICAL)
MASK OPTION
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