
Philips Semiconductors
Product data
P87LPC767
Low power, low price, low pin count (20 pin)
microcontroller with 4-kbyte OTP and 8-bit A/D converter
2002 Mar 25
39
80C51 INTERNAL BUS
SU01178
80C51 INTERNAL BUS
WRITE
TO
SBUF
ZERO DETECTOR
RxD
P1.1 ALT
OUTPUT
FUNCTION
TX CONTROL
S
TX CLOCK
START
Q
CL
D
SERIAL PORT
INTERRUPT
SHIFT
CLOCK
SHIFT
SEND
S6
RXD
P1.1 ALT
INPUT
FUNCTION
LOAD
SBUF
TI
INPUT SHIFT REGISTER
START
RI
RECEIVE
SHIFT
TX CLOCK
RX CONTROL
REN
RI
SBUF
READ
SBUF
TRANSMIT
TxD
P1.0 ALT
OUTPUT
FUNCTION
SEND
RXD (DATA OUT)
D0
D1
D5
D2
D6
D3
D4
D7
TXD (SHIFT CLOCK)
SHIFT
S1 ... S6
WRITE TO SBUF
TI
RECEIVE
D0
D1
D5
D2
D6
D3
D4
D7
TxD (SHIFT CLOCK)
SHIFT
WRITE TO SCON (CLEAR RI)
RI
RxD (DATA IN)
1
111
11
0
Figure 31. Serial Port Mode 0