DS80C390_00 Datasheet, PDF (60/155 Pages) Dallas Semiconductor – High-Speed Microcontroller User’s Guide Supplement

Status Register (STATUS)
7
6
SFR C5
PIP
HIP
R-0
R-0
DS80C390 High-Speed Microcontroller User’s Guide Supplement
5
4
3
2
1
0
LIP
-
SPTA1 SPRA1 SPTA0 SPRA0
R-0
R-*
R-0
R-0
R-0
R-0
R=Unrestricted Read, W=Unrestricted Write, -n=Value after Reset, *=See description
PIP
Bit 7
HP
Bit 6
LIP
Bit 5
Bit 4
SPTA1
Bit 3
SPRA1
Bit 2
SPTA0
Bit 1
SPRA0
Bit 0
Power Fail Priority Interrupt Status. When set, this bit indicates that software
is currently servicing a power-fail interrupt. It is cleared when the program
executes the corresponding RETI instruction.
High Priority Interrupt Status. When set, this bit indicates that software is
currently servicing a high priority interrupt. It is cleared when the program
executes the corresponding RETI instruction.
Low Priority Interrupt Status. When set, this bit indicates that software is
currently servicing a low priority interrupt. It is cleared when the program
executes the corresponding RETI instruction.
Reserved. Read value will be indeterminate.
Serial Port 1 Transmit Activity Monitor. When set, this bit indicates that data
is currently being transmitted by serial port 1. It is cleared when the internal
hardware sets the TI_1 bit. Do not alter the Clock Divide Control bits (PMR.7-6)
while this bit is set or serial port data may be lost.
Serial Port 1 Receive Activity Monitor. When set, this bit indicates that data is
currently being received by serial port 1. It is cleared when the internal hardware
sets the RI_1 bit. Do not alter the Clock Divide Control bits (PMR.7–6) while this
bit is set or serial port data may be lost.
Serial Port 0 Transmit Activity Monitor. When set, this bit indicates that data
is currently being transmitted by serial port 0. It is cleared when the internal
hardware sets the TI_1 bit. Do not alter the Clock Divide Control bits (PMR.7-6)
while this bit is set or serial port data may be lost.
Serial Port 0 Receive Activity Monitor. When set, this bit indicates that data is
currently being received by serial port 0. It is cleared when the internal hardware
sets the RI_1 bit. Do not alter the Clock Divide Control bits (PMR.7-6) while this
bit is set or serial port data may be lost.
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