Rainbow-electronics AT89C51SND1C Bedienungsanleitung PDF herunterladen (Seite 11)

AT8xC51SND1C

4109E–8051–06/03

Internal Pin Structure Table 15. Detailed Internal Pin Structure

Notes: 1. For information on resistors value, input/output levels, and drive capability, refer to

the Section “DC Characteristics”, page 181.

2. When the Two Wire controller is enabled, P

, P

, and P

transistors are disabled

allowing pseudo open-drain structure.

3. In Port 2, P

transistor is continuously driven when outputting a high level bit address

(A15:8).

Circuit

(1)

Type Pins

Input TST

Input/Output RST

Input/Output

(2)

(3)

P53:0

Input/Output

MCMD

MDAT

ISP

Output

ALE

SCLK

DCLK

DOUT

DSEL

MCLK

Input/Output

D+

D-

TST

VDD

RST

VSS

VDD

Watchdog Output

VSS

VDD VDD

2 osc

Latch Output

periods

VDD

VSS

VDD

VSS

VDD

D+

D-

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 209 210

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