71M6521BE
Energy Meter IC
DATA SHEET
JANUARY 2008
Bit
Symbol
Function
S0CON.7
SM0
These two bits set the UART0 mode:
Mode
Description
N/A
SM0
SM1
0
1
2
3
0
0
1
1
0
1
0
1
8-bit UART
9-bit UART
9-bit UART
S0CON.6
SM1
S0CON.5
S0CON.4
S0CON.3
SM20
REN0
TB80
Enables the inter-processor communication feature.
If set, enables serial reception. Cleared by software to disable reception.
The 9th transmitted data bit in Modes 2 and 3. Set or cleared by the
MPU, depending on the function it performs (parity check, multiprocessor
communication etc.)
S0CON.2
RB80
In Modes 2 and 3 it is the 9th 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
S0CON.0
TI0
RI0
Transmit interrupt flag, set by hardware after completion of a serial
transfer. Must be cleared by software.
Receive interrupt flag, set by hardware after completion of a serial
reception. Must be cleared by software
Table 16: The S0CON Bit Functions
Bit
Symbol
Function
S1CON.7
SM
Sets the baud rate for UART1
SM
0
Mode
Description
9-bit UART
8-bit UART
Baud Rate
variable
A
B
1
variable
S1CON.5
S1CON.4
S1CON.3
SM21
REN1
TB81
Enables the inter-processor communication feature.
If set, enables serial reception. Cleared by software to disable reception.
The 9th transmitted data bit in Mode A. Set or cleared by the MPU,
depending on the function it performs (parity check, multiprocessor
communication etc.)
S1CON.2
S1CON.1
S1CON.0
RB81
TI1
In Modes A and B, it is the 9th data bit received. In Mode B, if SM21 is 0,
RB81 is the stop bit. Must be cleared by software
Transmit interrupt flag, set by hardware after completion of a serial
transfer. Must be cleared by software.
RI1
Receive interrupt flag, set by hardware after completion of a serial
reception. Must be cleared by software
Table 17: The S1CON Bit Functions
Page: 24 of 97
© 2005-2008 TERIDIAN Semiconductor Corporation
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TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
