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71M6533/G/H and 71M6534/H Data Sheet
Table 17: The S0CON (UART0) Register (SFR 0x98)
FDS_6533_6534_004
Bit
Symbol
Function
The SM0 and SM1 bits set the UART0 mode:
S0CON[7]
S0CON[6]
SM0
SM1
Mode
0
1
2
3
Description
N/A
8-bit UART
9-bit UART
9-bit UART
SM0
0
0
1
1
SM1
0
1
0
1
In Modes 2 and 3 it is the 9 data bit received. In Mode 1, SM20 is 0, RB80
S0CON[5]
S0CON[4]
S0CON[3]
S0CON[2]
S0CON[1]
S0CON[0]
Bit
SM20
REN0
TB80
RB80
TI0
RI0
Symbol
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.)
th
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 18: The S1CON (UART1) Register (SFR 0x9B)
Function
S1CON[7]
SM
Sets the baud rate and mode for UART1 .
SM Mode Description
0 A 9-bit UART
Baud Rate
variable
1
B
8-bit UART
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 19: PCON Register Bit Description (SFR 0x87)
Bit
PCON[7]
PCON[6:2]
PCON[1]
PCON[0]
28
Symbol
SMOD
–
STOP
IDLE
Function
The SMOD bit doubles the baud rate when set
Not used.
Stops MPU flash access and MPU peripherals including timers and UARTs
when set until an external interrupt is received.
Stops MPU flash access when set until an internal interrupt is received.
Rev 2
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