Maxim Integrated 71M6513H Power Meter IC Family Software - Manual (Page 120)

71M651x Software User’s Guide
Bit Symbol Function
S0CON.7 SM0 Sets baud rate
S0CON.6 SM1 Sets baud rate
S0CON.5 SM20 reserved
S0CON.4 REN0 If set, enables serial reception. Cleared by software to disable reception.
S0CON.3 TB80 The 9 th transmitted data bit in Modes 2 and 3. Set or cleared by the
MPU, depending on the function it performs (parity check, multipro-
cessor communication etc.)
S0CON.2 RB80 In Modes 2 and 3 it is the 9 th data bit received. In Mode 1, if SM20 is 0,
RB80 is the stop bit. In Mode 0 this bit is not used. Must be cleared by
software
S0CON.1 TI0 Transmit interrupt flag, set by hardware after completion of a serial
transfer. Must be cleared by software.
S0CON.0 RI0 Receive interrupt flag, set by hardware after completion of a serial
reception. Must be cleared by software
Table 6-28: The S0CON Bit Functions
SM0 SM1 Mode Description Baud Rate
0 0 0 shift register Fclk/12
0 1 1 8-bit UART Variable
1 0 2 9-bit UART Fclk/32 or /64
1 1 3 9-bit UART Variable
Table 6-29: Serial Port 0 Modes
The speed in Mode 2 depends on the smod bit in the Special Function Register PCON when smod = 1,
Fclk/32. See the PCON register description.
Serial Interface 1 Modes
The Serial Interface 1 can operate in 2 modes:
sm Mode Description Baud Rate
0 A 9-bit UART variable
1 B 8-bit UART variable
Table 6-30: Serial 1 Modes
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