Maxim Integrated MAXQ610 - Manual (Page 89)

5-17
MAXQ610 User’s Guide
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 .