MAXQ3108 Maxim Integrated Products, MAXQ3108 Datasheet - Page 35

• Manufacturer Part Number: MAXQ3108
• Description: Dual-Core Microcontroller
• Manufacturer: Maxim Integrated Products

www.DataSheet4U.com
SCON0.7:SM0/FE
SBUF0 (07h, 02h)
Initialization:
Read/Write Access:
SBUF0.[7:0]:
SMD0 (08h, 02h)
Initialization:
Read/Write Access:
SMD0.0: FEDE
SMD0.1: SMOD
SMD0.2: ESI
SMD0.[5:3]: Reserved
SMD0.6: OFS
______________________________________________________________________________________
Low-Power, Dual-Core Microcontroller
Serial Port 0 Mode Bit 0/Framing Error Flag. When FEDE is 0, this is the SM0 bit. When FEDE is
set to 1, this bit is the FE 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.
Serial Data Buffer 0
This buffer is cleared to 00h on all forms of reset.
Unrestricted read/write.
Serial Data Buffer 0 Bit 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.
Serial Port Mode Register 0
This register is cleared to 00h on all forms of reset.
Unrestricted read/write.
Framing-Error-Detection Enable. This bit selects the function of SM0 (SCON0.7).
Serial Port 0 Baud-Rate Select. The SMOD selects the final baud rate for the asynchronous mode:
Enable Serial Port 0 Interrupt. Setting this bit to 1 enables interrupt requests generated by the RI
or TI flags in SCON0. Clearing this bit to 0 disables the serial port interrupt.
Reserved. Reads return 0.
Output Function Select. This bit selects the PWM output function when EPWM = 1. When EPWM =
1, the OFS bit selects one of the following modes:
Note that the PWM function is not possible for UART mode 0 and this bit has no effect during UART
mode 0 operation.
MODE
FEDE = 0: SCON0.7 functions as SM0 for serial-port mode selection.
FEDE = 1: SCON0.7 is converted to the FE flag.
SMOD = 1: 16 times the baud clock for mode 1 and 3; 32 times the system clock for mode 2.
SMOD = 0: 64 times the baud clock for mode 1 and 3; 64 times the system clock for mode 2.
OFS = 0: logical NOR between UART0 TXD output and T2L waveform.
OFS = 1: logical OR between UART0 TXD output and T2L waveform.
Special Function Register Bit Descriptions (continued)
0
0
1
2
2
3
3
SM2
0
1
X
0
1
0
1
SM1
0
0
1
0
0
1
1
SM0
0
0
0
1
1
1
1
Synchronous
Synchronous
Asynchronous
Asynchronous
Asynchronous (MP)
Asynchronous
Asynchronous (MP)
FUNCTION
LENGTH
(BITS)
10
11
11
11
11
8
8
12 system clock
4 system clock
64/16 baud clock
(SMOD = 0/1)
64/32 system clock
(SMOD = 0/1)
64/32 system clock
(SMOD = 0/1)
64/16 baud clock
(SMOD = 0/1)
64/16 baud clock
(SMOD = 0/1)
PERIOD
35