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參數(shù)資料
| 型號(hào)： | MC68HSC05P1ADW |
| 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, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數(shù)： | 35/124頁 |
| 文件大?。?/td> | 623K |
| 代理商： | MC68HSC05P1ADW |
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NON-DISCLOSURE
AGREEMENT
REQUIRED
General Description
General Release Specification
MC68HC05P1A — Rev. 3.0
18
General Description
MOTOROLA
1.4 Mask Options
The MC68HC05P1A has 12 mask options. The default state of these
mask options and their alternate states are:
1. IRQ is Edge- and Level-Sensitive — Option for Edge-Sensitive
Only
2. Crystal/Ceramic Resonator Oscillator Mode — Option for
Resistor/Capacitor (RC) Mode
3. COP Watchdog Timer Enabled — Option to Disable
4. Stop Instruction Enabled — Option to Convert to Halt
5. Eight (8) Port A Pullups/Interrupts Disabled — Option to
Individually Enable
1.5 Functional Pin Description
The following paragraphs describe the functionality of each pin on the
MC68HC05P1A package. The device also is available with an alternate
pinout where VDD and VSS are adjacent to reduce radio frequency (RF)
emissions. This also improves the ability to decouple VDD and VSS,
which may provide some benefit for conducted RF emissions as well.
The pinouts are shown in Figure 1-2 and Figure 1-3. They are
compatible with the MC68HC05P1 microcontroller unit (MCU).
1.5.1 VDD and VSS
Power is supplied to the MCU through VDD and VSS. VDD is connected
to a regulated +5 volt supply and VSS is connected to ground.
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.
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