P87C51RB2 PHILIPS [NXP Semiconductors], P87C51RB2 Datasheet - Page 26

• Manufacturer Part Number: P87C51RB2
• Description: 80C51 8-bit microcontroller family
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
2003 Jan 24
80C51 8-bit microcontroller family
with 512B/1KB RAM, low voltage (2.7 to 5.5 V), low power, high
speed (30/33 MHz)
Data
Shift
TxD
TI
Stop Bit Gen.
RxD
Shift
Bit Detector
Sample Times
RI
Clock
Clock
RX
TX
Mode 2
2
Write to SBUF
Phase 2 Clock
(1/2 f
OSC
SMOD = 1
SMOD = 0
(SMOD is
PCON.7)
16 Reset
Start Bit
)
Send
RxD
Start
Bit
S1P1
SBUF
Write
D0
D0
to
Transition
Detector
1-to-0
Sample
D1
D1
Interrupt
Serial
16
Port
8KB/16KB/32KB/64KB OTP
D2
D2
D
CL
TB8
Figure 11. Serial Port Mode 2
S
Bit Detector
Q
TX Clock
Start
Read
SBUF
Start
D3
D3
16
Stop Bit
RX Clock
Load
SBUF
Gen.
Zero Detector
D4
26
D4
TX Control
RX Control
80C51 Internal Bus
80C51 Internal Bus
SBUF
Input Shift Register
T1
R1
D5
D5
SBUF
Shift
(9 Bits)
1FFH
D6
D6
Load
SBUF
Data
Send
Shift
P87C51RA2/RB2/RC2/RD2
Shift
D7
D7
TB8
RB8
Stop Bit
Stop Bit
Product data
TxD
Transmit
Receive
SU00541