Texas Instruments MSC1210 - Manual (Page 119)

Types of Interrupts
10-13
Interrupts
The AISTAT (A7
H
) is a read-only SFR that returns the current state of interrupt
conditions that are enabled. Any condition that is configured to provoke an in-
terrupt and is currently true will return a 1. Any condition that is not currently
true or was not configured to provoke an interrupt will return a 0.
Table 10−10. AISTAT (A7
H
) SFR
Bit Name Explanation of Function Clear Interrupt
7 SEC Detect seconds auxiliary interrupt Read SECINT
6 SUM Detect summation auxiliary interrupt Read SUMR0
5 ADC Detect ADC conversion auxiliary interrupt Read ADRESL
4 MSEC Detect millisecond auxiliary interrupt Read MSINT
3 SPIT Detect SPI transmit auxiliary interrupt Write SPIDATA
2 SPIR Detect SPI receive auxiliary interrupt Read SPIDATA
1 ALVD Detect analog low-voltage auxiliary interrupt Voltage above
threshold
0 DLVD Detect digital low-voltage or breakpoint auxil-
iary interrupt Write BP = 1
Note:
AISTAT is read-only. A value may not be written to this SFR with the expecta-
tion of triggering the specific auxiliary interrupt. An auxiliary interrupt may be
triggered by setting the EICON.4 (AI) flag, but which auxiliary interrupt will
be triggered in software cannot be specified.
When an Auxiliary interrupt occurs, the MSC1210 will vector to the ISR at
0033
H
. The code of the ISR may use the Pending Auxiliary Interrupt (PAI, A5
H
)
SFR to determine which of the auxiliary interrupts provoked the actual inter-
rupt.
Table 10−11. PAI (A5
H
) SFR
Bit Name Explanation of Function
7 − Undefined
6 − Undefined
5 − Undefined
4 − Undefined
3 PAI3 Bit 3 of Auxiliary Interrupt Index
2 PAI2 Bit 2 of Auxiliary Interrupt Index
1 PAI1 Bit 1 of Auxiliary Interrupt Index
0 PAI0 Bit 0 of Auxiliary Interrupt Index