Philips Semiconductors
Preliminary data
Low power, low price, low pin count (20 pin)
microcontroller with 4 kbyte OTP
87LPC764
80C51 INTERNAL BUS
WRITE
TO
SBUF
S
D
RxD
P1.1 ALT
OUTPUT
FUNCTION
SBUF
Q
CL
ZERO DETECTOR
START
SHIFT
SEND
TX CONTROL
TI
TxD
TX CLOCK
S6
P1.0 ALT
OUTPUT
FUNCTION
SERIAL PORT
INTERRUPT
SHIFT
CLOCK
RI
TX CLOCK
START
RECEIVE
SHIFT
RX CONTROL
REN
RI
1
1
1
1
1
1
1
0
RXD
P1.1 ALT
INPUT
INPUT SHIFT REGISTER
FUNCTION
LOAD
SBUF
SBUF
READ
SBUF
80C51 INTERNAL BUS
S1 ... S6 S1 ... S6 S1 ... S6 S1 ... S6 S1 ... S6 S1 ... S6 S1 ... S6 S1 ... S6 S1 ... S6 S1 ... S6 S1 ... S6 S1 ... S6 S1 ... S6
WRITE TO SBUF
SEND
SHIFT
TRANSMIT
D0
D1
D2
D3
D4
D5
D6
D7
RXD (DATA OUT)
TXD (SHIFT CLOCK)
TI
WRITE TO SCON (CLEAR RI)
RI
RECEIVE
RECEIVE
SU01178
SHIFT
RxD (DATA IN)
D0
D1
D2
D3
D4
D5
D6
D7
TxD (SHIFT CLOCK)
Figure 29. Serial Port Mode 0
35
2001 Oct 26
NXP [ NXP ]
