71M6403
Electronic Trip Unit
SEPTEMBER 2006
Bit
S1CON.7
Symbol
SM
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
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
RB81
In Modes 2 and 3, it is the 9th data bit received. In Mode B, if sm21 is 0,
rb81 is the stop bit. In Mode 0 this bit is not used. Must be cleared by
software.
S1CON.1
S1CON.0
TI1
RI1
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 S1CON Bit Functions
Page: 23 of 75
© 2006 TERIDIAN Semiconductor Corporation
REV 1.0
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
