AT89C51AC2 查看數據表（PDF） - Atmel Corporation

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AT89C51AC2

Enhanced 8-bit Microcontroller with 32 KB Flash Memory

Atmel Corporation 

A/T89C51AC2

Figure 4. Internal Pull-Up Configurations

2 Osc. PERIODS

OUTPUT DATA

INPUT DATA

READ PIN

VCC VCC

p1(1) p2

VCC

p3

n

P1.x

P2.x

P3.x

P4.x

Note: Port 2 p1 assists the logic-one output for memory bus cycles.

9

4127H–8051–02/08

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