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PDF P-80C52 Datasheet ( Hoja de datos )

Número de pieza P-80C52
Descripción (P-80C32 / P-80C52) CMOS 8-Bit Microcontroller
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P-80C52 datasheet

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P-80C52 pdf
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80C32/80C52
Port Pin
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
Alternate Function
RXD (serial input port)
TXD (serial output port)
INT0 (external interrupt 0)
INT1 (external interrupt 1)
TD (Timer 0 external input)
T1 (Timer 1 external input)
WR (external Data Memory write strobe)
RD (external Data Memory read strobe)
Port 3 can sink/source three LS TTL inputs. It can drive CMOS inputs without external pullups.
5.7. RST
A high level on this for two machine cycles while the oscillator is running resets the device. An internal pull-down
resistor permits Power-On reset using only a capacitor connected to VCC. As soon as the Reset is applied (Vin), PORT
1, 2 and 3 are tied to one. This operation is achieved asynchronously even if the oscillator does not start-up.
5.8. ALE
Address Latch Enable output for latching the low byte of the address during accesses to external memory. ALE is
activated as though for this purpose at a constant rate of 1/6 the oscillator frequency except during an external data
memory access at which time one ALE pulse is skipped. ALE can sink/source 8 LS TTL inputs. It can drive CMOS
inputs without an external pullup.
5.9. PSEN
Program Store Enable output is the read strobe to external Program Memory. PSEN is activated twice each machine
cycle during fetches from external Program Memory. (However, when executing out of external Program Memory, two
activations of PSEN are skipped during each access to external Data Memory). PSEN is not activated during fetches
from internal Program Memory. PSEN can sink/source 8 LS TTL inputs. It can drive CMOS inputs without an external
pullup.
5.10. EA
When EA is held high, the CPU executes out of internal Program Memory (unless the Program Counter exceeds 1
FFFH). When EA is held low, the CPU executes only out of external Program Memory. EA must not be floated.
5.11. XTAL1
Input to the inverting amplifier that forms the oscillator. Receives the external oscillator signal when an external
oscillator is used.
Output of the inverting amplifier that forms the oscillator. This pin should be floated when an external oscillator is used.
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Rev. I September 18, 1998
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P-80C52 arduino
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80C32/80C52
OSC
T2
12
0
1
C/T2
TR2
T2CON.1 T2CON.2
T2EX
EXEN2
T2CON.3
TH2
(8 bits)
Overflow
TL2
(8 bits)
TF2
T2CON.7
RCAP2H RCAP2L
EXF2
T2CON.6
Timer 2
Interrupt
Request
Figure 7. Timer 2 in Capture Mode
In the auto-reload mode there are again two options, which are selected by bit EXEN2 in T2CON.If EXEN2 = 0, then
when Timer 2 rolls over it does not only set TF2 but also causes the Timer 2 register to be reloaded with the 16 bit value
in registers RCAP2L and RCAP2H, which are preset by software. If EXEN2 = 1, then Timer 2 still does the above,
but with the added feature that a 1-to-0 transition at external input T2EX will also trigger the 16 bit reload and set EXF2.
The auto-reload mode is illustrated in Figure 8.
OSC
T2
T2EX
12
0
1
TH2
(8 bits)
TL2 Overflow
(8 bits)
TF2
T2CON.7
C/T2
TR2
T2CON.1 T2CON.2
RCAP2H RCAP2L
EXEN2
T2CON.3
EXF2
T2CON.6
Timer 2
Interrupt
Request
Figure 8. Timer in Auto–Reload Mode
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Rev. I September 18, 1998

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