P87C51RA2 Philips Semiconductors, P87C51RA2 Datasheet - Page 27

• Manufacturer Part Number: P87C51RA2
• Description: 80C51 8-bit microcontroller family
• Manufacturer: Philips 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)
SMOD = 0
Data
Shift
TxD
TI
Stop Bit Gen.
RxD
Shift
Bit Detector
Sample Times
RI
Clock
Clock
TX
RX
Overflow
Timer 1
Write to SBUF
2
SMOD = 1
16 Reset
RxD
Start Bit
Send
Start
Bit
S1P1
SBUF
Write
Interrupt
Serial
to
Port
D0
D0
Transition
Detector
1-to-0
Sample
D1
16
D1
8KB/16KB/32KB/64KB OTP
D2
D2
D
CL
TB8
Figure 12. Serial Port Mode 3
S
Bit Detector
Q
TX Clock
Start
Read
SBUF
Start
D3
D3
16
RX Clock
Load
SBUF
Zero Detector
27
TX Control
RX Control
D4
D4
80C51 Internal Bus
80C51 Internal Bus
T1
R1
SBUF
Input Shift Register
SBUF
Shift
D5
D5
(9 Bits)
1FFH
Load
SBUF
D6
Data
Send
D6
Shift
P87C51RA2/RB2/RC2/RD2
Shift
D7
D7
TB8
RB8
Stop Bit
Stop Bit
Product data
TxD
Transmit
Receive
SU00542