AT89C55WD-33AU Просмотр технического описания (PDF) - Atmel Corporation

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AT89C55WD-33AU

8-bit Microcontroller with 20K Bytes Flash

Atmel Corporation 

Figure 18-1. Oscillator Connections

C2

C1

AT89C55WD

XTAL2

XTAL1

GND

Note: C1, C2 = 30 pF ± 10 pF for Crystals

= 40 pF ± 10 pF for Ceramic Resonators

Figure 18-2. External Clock Drive Configuration

NC

XTAL2

EXTERNAL

OSCILLATOR

SIGNAL

XTAL1

GND

Table 18-1. Status of External Pins During Idle and Power-down Modes

Mode

Program

Memory

ALE

PSEN PORT0 PORT1 PORT2

Idle

Internal

1

1

Data

Data

Data

Idle

External

1

1

Float

Data Address

Power-down Internal

0

0

Data

Data

Data

Power-down External

0

0

Float

Data

Data

PORT3

Data

Data

Data

Data

19

1921D–MICRO–6/08

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