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參數(shù)資料
| 型號： | MC68HC05CL48 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 1.802 MHz, MICROCONTROLLER, PQFP112 |
| 封裝： | TQFP-112 |
| 文件頁數(shù)： | 55/145頁 |
| 文件大小： | 673K |
| 代理商： | MC68HC05CL48 |
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June 11, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05CL48
GENERAL DESCRIPTION
MOTOROLA
REV 2.0
1-5
1.4
SIGNAL DESCRIPTION
The following paragraphs give a description of the general function of each pin.
1.4.1 VDD and VSS
Power is supplied to the MCU through V
DD and VSS pins. VDD is connected to a
regulated positive supply and V
SS is connected to ground. These pins are located
close to each other for low EMI, Electro Magnetic Interference, emission.
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, take special care to provide good power supply bypassing at the
MCU. Use bypass capacitors with good high-frequency characteristics, and
position them as close to the MCU as possible. Bypassing requirements vary,
depending on how heavily the MCU pins are loaded.
Figure 1-3. Power Supply Decoupling
1.4.2 RESET
This pin can be used as an input to reset the MCU to a known start-up 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. The
RESET pin has an internal pulldown device that pulls the RESET pin low when
there is an internal COP Watchdog reset or during the power-on reset cycles.
Refer to Section 5.
1.4.3 IRQ
This pin has an option in the option register that provides two different choices of
interrupt triggering sensitivity. The IRQ pin contains an internal Schmitt trigger as
part of its input to improve noise immunity. Refer to Section 4.
VDD
VSS
0.47uF (Ceramic)
1uF
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