MC68HC11E20CFN3 데이터 시트보기 (PDF) - Freescale Semiconductor

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MC68HC11E20CFN3

HC11 Microcontrollers

Freescale Semiconductor 

Pin Descriptions

1.4.1 VDD and VSS

Power is supplied to the MCU through VDD and VSS. VDD is the power supply, VSS is ground. The MCU

operates from a single 5-volt (nominal) power supply. Low-voltage devices in the E series operate at

3.0–5.5 volts.

Very fast signal transitions occur on the MCU pins. The short rise and fall times place high, short duration

current demands on the power supply. To prevent noise problems, provide good power supply bypassing

at the MCU. Also, use bypass capacitors that have good

high-frequency characteristics and situate them as close to the MCU as possible. Bypass requirements

vary, depending on how heavily the MCU pins are loaded.

VDD

VDD

2

IN

1

RESET

MC34(0/1)64

GND

3

4.7 kΩ

TO RESET

OF M68HC11

Figure 1-7. External Reset Circuit

VDD

VDD

VDD

MANUAL

RESET SWITCH

4.7 kΩ

4.7 k Ω

1.0 µF

IN

RESET

MC34164

GND

IN

RESET

MC34064

GND

4.7 kΩ

TO RESET

OF M68HC11

OPTIONAL POWER-ON DELAY AND MANUAL RESET SWITCH

Figure 1-8. External Reset Circuit with Delay

M68HC11E Family Data Sheet, Rev. 5.1

Freescale Semiconductor

21

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