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P80C31X2 View Datasheet(PDF) - NXP Semiconductors.

Part NameDescriptionManufacturer
P80C31X2 80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz) NXP
NXP Semiconductors. NXP
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
80C51 Internal Bus
TB8
Phase 2 Clock
(1/2 fOSC in
12-clock mode;
fOSC in 6-clock
mode)
Write
to
SBUF
DS Q
CL
SBUF
Zero Detector
Mode 2
SMOD = 1
÷2
SMOD = 0
(SMOD is
PCON.7)
÷ 16
Serial
Port
Interrupt
Sample
1-to-0
Transition
Detector
RxD
Stop Bit
Shift
Start Gen.
TX Control
TX Clock
T1
Data
Send
÷ 16
Start
RX Clock R1
RX Control
Load
SBUF
Shift
1FFH
Bit Detector
Load
SBUF
Input Shift Register
(9 Bits)
Shift
SBUF
Read
SBUF
TX
Clock
80C51 Internal Bus
Data
Shift
Write to SBUF
Send
S1P1
TxD
Start Bit
D0
D1
D2
D3
D4
D5
D6
D7
TB8
TI
Stop Bit Gen.
RX
Clock
÷ 16 Reset
RxD
Bit Detector
Sample Times
Start
Bit
D0
D1
D2
D3
D4
D5
D6
D7
RB8
Shift
RI
Figure 16. Serial Port Mode 2
2003 Jan 24
28
Stop Bit
Stop Bit
TxD
Transmit
Receive
SU01627
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