Maxim Integrated MAXQ622 User Manual
Page 92
MAXQ612/MAXQ622 User’s Guide
Maxim Integrated
5-19
REGISTER
DESCRIPTION
SCON0.6 (SM1)
SCON0.7 (SM0/FE)
Serial Port 0 Mode Bits 1:0 (when FEDE is 0) . When FEDE is set to 1, this bit is the
Framing Error Flag that is set upon detection of an invalid stop bit . It must be cleared by
software . Modification of this bit when FEDE is set has no effect on the serial mode .
MODE
SM2
SM1
SM0
FUNCTION
LENGTH
(BITS)
PERIOD
0
0
0
0
Synchronous
8
12 system clocks
0
1
0
0
Synchronous
8
4 system clocks
1
x
1
0
Asynchronous
10
64/16 baud clocks
(SMOD = 0/1)
2
0
0
1
Asynchronous
11
64/32 system
clocks (SMOD =
0/1)
2
1
0
1
Asynchronous (MP)
11
64/32 system
clocks (SMOD =
0/1)
3
0
1
1
Asynchronous
11
64/16 baud clocks
(SMOD = 0/1)
3
1
1
1
Asynchronous (MP)
11
64/16 baud clocks
(SMOD = 0/1)
SBUF0 (01h, 03h)
Serial Data Buffer 0
Initialization:
This buffer is cleared to 00h on all forms of reset .
Read/Write Access:
Unrestricted read/write .
SBUF0.7 to SBUF0.0
Serial Data Buffer 0 Bits 7:0. Data for serial port 0 is read from or written to this location .
The serial transmit and receive buffers are separate but both are addressed at this location .