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Microcontrollers, Microprocessors & Quartzes
Embedded microcontroller PLCC 44 (16.59x16.59) 8-Bit 40 MHz I/O number 34
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A/T89C51AC2
4127H–8051–
02/08
Figure 4.
I
nternal Pul
l-Up Configura
tions
Note:
Port 2 p1 assists the logic-one output for memory bus cycles.
READ P
IN
INP
UT DA
T
A
P1.x
OUT
PUT
DA
T
A
2 O
sc. PER
IOD
S
n
p1(1)
p2
p3
VCC
VCC
VCC
P2.x
P3.x
P4.x
1
...
...
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9
10
11
...
...
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