UPSD3212A Datasheet, PDF (56/163 Pages) STMicroelectronics – Flash Programmable System Devices with 8032 MCU with USB and Programmable Logic

uPSD3212A, uPSD3212C, uPSD3212CV
Serial Port Control Register
The serial port control and status register is the
Special Function Register SCON (SCON2 for the
second port), shown in Figure 27. This register
(see Tables 43 and 44) contains not only the mode
Figure 27. Serial Port Mode 0, Block Diagram
selection bits, but also the 9th data bit for transmit
and receive (TB8 and RB8), and the Serial Port In-
terrupt Bits (TI and RI).
Write
to
SBUF
Internal Bus
D SQ
CL
SBUF
Zero Detector
RxD
P3.0 Alt
Output
Function
S6
REN
R1
Start
Tx Clock
Tx Control
T
Shift
Send
Serial
Port
Interrupt
Rx Clock
Start
R
Receive
Rx Control
Shift
76543210
Load
SBUF
Read
SBUF
Input Shift Register
SBUF
Shift
Internal Bus
Shift
Clock
RxD
P3.0 Alt
Input
Function
TxD
P3.1 Alt
Output
Function
AI06824
Table 43. Serial Port Control Register (SCON)
7
6
5
4
3
2
1
0
SM0
SM1
SM2
REN
TB8
RB8
TI
RI
56/163