80CL31 Datasheet, PDF (15/40 Pages) NXP Semiconductors – Low-voltage single-chip 8-bit microcontrollers

Philips Semiconductors
Low-voltage single-chip 8-bit microcontrollers
Product specification
80CL31/80CL51
80CL51 Internal Bus
Write
to
SBUF
DS Q
CL
SBUF
Zero Detector
RxD
P3.0 Alt
Output
Function
S6
REN
RI
Serial
Port
Interrupt
Start
TX Clock
TX Control
T1
Shift
Send
RX Clock
Start
R1
Receive
RX Control
Shift
1111111 0
Load
SBUF
Input Shift Register
Shift
Shift
Clock
TxD
P3.1 Alt
Output
Function
RxD
P3.0 Alt
Input
Function
SBUF
Read
SBUF
80CL51 Internal Bus
S4 . . S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1
ALE
Write to SBUF
Send
S6P2
T
r
a
Shift
n
s
m
RxD (Data Out)
D0
D1
D2
D3
D4
D5
D6
D7
i
t
TxD (Shift Clock)
TI
S3P1
S6P1
Write to SCON (Clear RI)
RI
R
Receive
e
c
Shift
e
RxD (Data In)
D0
D1
D2
D3
D4
D5
D6
D7
i
v
e
S5P2
TxD (Shift Clock)
Figure 7. Serial Port Mode 0
January 1995
15