Philips Semiconductors
Low power, low price, low pin count (20 pin)
microcontroller with 4 kB OTP 8-bit A/D, and DAC
Preliminary specification
87LPC769
TB8
WRITE
TO SBUF
80C51 INTERNAL BUS
TIMER 1
OVERFLOW
÷2
DS
Q
CL
SBUF
ZERO DETECTOR
SMOD1 = 0
SMOD1
=1
÷16
1-TO-0
TRANSITION
DETECTOR
START
TX CLOCK
TX CONTROL
TI
SHIFT
DATA
SEND
÷16
START
RX
RI
CLOCK
RX CONTROL
LOAD SBUF
SHIFT
1FFH
SERIAL PORT
INTERRUPT
RxD
P1.1 ALT
INPUT
FUNCTION
BIT
DETECTOR
LOAD
SBUF
READ
SBUF
INPUT SHIFT REGISTER
SBUF
80C51 INTERNAL BUS
TxD
P1.0 ALT
OUTPUT
FUNCTION
TX CLOCK
WRITE TO SBUF
SEND
DATA
SHIFT
TxD
TI
START
BIT
D0
D1
D2
D3
D4
D5
D6
D7
STOP BIT
TRANSMIT
RX CLOCK
RxD
START
÷ 16 RESET
BIT
D0
D1
D2
D3
D4
D5
D6
D7
STOP BIT
BIT DETECTOR SAMPLE TIMES
SHIFT
RI
Figure 33. Serial Port Mode 1
RECEIVE
SU01179
2001 Jan 11
42