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P80C31X2 View Datasheet(PDF) - NXP Semiconductors.

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Description
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P80C31X2 Datasheet PDF : 62 Pages
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Philips Semiconductors
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V),
low power, high speed (30/33 MHz)
Product data
P80C3xX2; P80C5xX2;
P87C5xX2
Timer 1
Overflow
80C51 Internal Bus
TB8
Write
÷2
to
SMOD = 0
SMOD = 1
SBUF
DS Q
SBUF
CL
TxD
Zero Detector
Serial
Port
Interrupt
÷ 16
Sample
1-to-0
Transition
Detector
RxD
Start
TX Clock
Shift
TX Control
T1
Data
Send
÷ 16
RX Clock R1
Start
RX Control
Load
SBUF
Shift
1FFH
Bit Detector
Load
SBUF
Input Shift Register
(9 Bits)
Shift
SBUF
Read
SBUF
TX
Clock
Data
Shift
Write to SBUF
Send
S1P1
TxD
Start Bit
D0
D1
D2
D3
TI
Stop Bit Gen.
RX
Clock
÷ 16 Reset
RxD
Bit Detector
Sample Times
Start
Bit
D0
D1
D2
D3
Shift
RI
80C51 Internal Bus
D4
D5
D6
D7
TB8
D4
D5
D6
D7
RB8
Stop Bit
Stop Bit
Figure 17. Serial Port Mode 3
2003 Jan 24
29
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SU00542
 

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