Datasheet

Philips Semiconductors Product data
P80C3xX2; P80C5xX2;
P87C5xX2
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)
2003 Jan 24
26
80C51 Internal Bus
SBUF
Zero Detector
D Q
S
CL
Write
to
SBUF
TX Control
TX Clock Send
ShiftStart
S6
RX Control
Start
Shift
ReceiveRX Clock
T1
R1
Serial
Port
Interrupt
1 1 1 1 1 1 1 0
Input Shift Register
REN
RI
Load
SBUF
Shift
Shift
Clock
RxD
P3.0 Alt
Output
Function
TxD
P3.1 Alt
Output
Function
SBUF
Read
SBUF
80C51 Internal Bus
RxD
P3.0 Alt
Input
Function
Write to SBUF
S6P2
Send
Shift
RxD (Data Out) D0 D1 D2 D3 D4 D5 D6 D7
Transmit
TxD (Shift Clock)
TI
S3P1 S6P1
Write to SCON (Clear RI)
RI
Receive
Shift
RxD (Data In)
D0 D1 D2 D3 D4 D5 D6
TxD (Shift Clock)
S5P2
Receive
D7
ALE
S4 . . S1 S6. . . . S1 S6. . . . S1 S6. . . . S1 S6. . . . S1 S6. . . . S1 S6. . . . S1 S6. . . . S1 S6. . . . S1 S6. . . . S1 S6. . . . S1
SU00539
LSB
LSB
MSB
MSB
Figure 14. Serial Port Mode 0