SDA55XX Datasheet, PDF (118/230 Pages) Infineon Technologies AG – Preliminary & Confidential

SDA 55xx
Preliminary & Confidential
Serial Port Control RegisterSCON
Default after reset: 00_H
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SM0
SM1
SM2
REN
SFR-Address 98_H
UART
TB8
RB8
(LSB)
TI
RI
SM0
SM1
SM2
REN
TB8
RB8
TI
RI
Serial Port Mode Selection, see table below.
Serial Port Mode Selection, see table below
Enables the multiprocessor communication feature in modes 2 and 3. In mode
2or 3, if SM2 is set to 1 then RI will not be activated if the received 9th data bit
(RB8) is 0. In mode 1, if SM2 = 1 then RI will not be activated if a valid stop bit
was not received. In mode 0, SM2 should be 0.
Enables serial reception. Set by software to enable reception. Cleared by
software to disable reception.
Is the 9th data bit that will be transmitted in modes 2 and 3. Set or cleared by
software as desired.
In modes 2 and 3, is the 9th data bit that was received. In mode 1, if SM2 = 0,
RB8 is the stop bit that was received. In mode 0, RB8 is not used.
Is the transmit interrupt flag. Set by hardware at the end of the 8th bit time in
mode 0, or at the beginning of the stop bit in the other modes, in any serial
transmission. Must be cleared by software.
Is the receive interrupt flag. Set by hardware at the end of the 8th bit time in
mode 0, or halfway through stop bit time in the other modes, in any serial
reception. Must be cleared by software.
60




60
0
1
0
1
0RGH
0
1
2
3
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Shift Reg.
8-bit UART
9-bit UART
9-bit UART
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I_system/12
Variable
, I_system/64 I_system/32
Variable
In all four modes, transmission is initiated by any instruction that uses SBUF as a
destination register. Reception is initiated in mode 0 by the condition Rl = 0 and
REN = 1. Reception is initiated in the other modes by the incoming start bit if REN = 1.
Semiconductor Group
118
User’s Manual July 99