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71M6521BE
Energy Meter IC
DATA SHEET
JANUARY 2008
Bit
S0CON.7
Symbol
SM0
Function
These two bits set the UART0 mode:
Mode
0
Description
N/A
SM0
0
SM1
0
S0CON.6
SM1
1
2
3
8-bit UART
9-bit UART
9-bit UART
0
1
1
1
0
1
S0CON.5
S0CON.4
S0CON.3
S0CON.2
S0CON.1
S0CON.0
Bit
S1CON.7
SM20
REN0
TB80
RB80
TI0
RI0
Symbol
SM
Enables the inter-processor communication feature.
If set, enables serial reception. Cleared by software to disable reception.
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, multiprocessor
communication etc.)
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
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
Function
Sets the baud rate for UART1
SM
0
1
Mode
A
B
Description
9-bit UART
8-bit UART
Baud Rate
variable
variable
S1CON.5
S1CON.4
S1CON.3
S1CON.2
S1CON.1
S1CON.0
SM21
REN1
TB81
RB81
TI1
RI1
Enables the inter-processor communication feature.
If set, enables serial reception. Cleared by software to disable reception.
The 9 th transmitted data bit in Mode A. Set or cleared by the MPU,
depending on the function it performs (parity check, multiprocessor
communication etc.)
In Modes A and B, it is the 9 th 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.
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
V1.0
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