CP3BT10 Datasheet, PDF (49/210 Pages) National Semiconductor (TI) – Reprogrammable Connectivity Processor with Bluetooth and USB Interfaces

10.3.6 Interrupt Status Register 0 (ISTAT0)
10.4 MASKABLE INTERRUPT SOURCES
The ISTAT0 register is a word-wide read-only register. It in-
dicates which maskable interrupt inputs to the ICU are ac-
tive. These bits are not affected by the state of the
corresponding IENA bits.
Table 22 shows the interrupts assigned to various on-chip
maskable interrupts. The priority of simultaneous maskable
interrupts is linear, with IRQ31 having the highest priority.
Table 22 Maskable Interrupts Assignment
15
IST
1
0
Res.
IRQ Number
Details
IRQ31
TWM (Timer 0)
IST
The Interrupt Status bits indicate if a
maskable interrupt source is signalling an in-
terrupt request. IST[15:1] correspond to
IRQ15 to IRQ1 respectively. Because the
IRQ0 interrupt is not used, bit 0 always reads
back 0.
0 – Interrupt is not active.
1 – Interrupt is active.
10.3.7 Interrupt Status Register 1 (ISTAT1)
The ISTAT1 register is a word-wide read-only register. It in-
dicates which maskable interrupt inputs into the ICU are ac-
tive. These bits are not affected by the state of the
corresponding IENA bits.
IRQ30
IRQ29
IRQ28
IRQ27
IRQ26
IRQ25
IRQ24
IRQ23
IRQ22
IRQ21
Bluetooth LLC 0
Bluetooth LLC 1
Bluetooth LLC 2
Bluetooth LLC 3
Bluetooth LLC 4
Bluetooth LLC 5
USB Interface
DMA Channel 0
DMA Channel 1
DMA Channel 2
15
IST
0
IRQ20
DMA Channel 3
IRQ19
Reserved
IRQ18
Advanced Audio Interface
IST
The Interrupt Status bits indicate if a
IRQ17
UART Rx
maskable interrupt source is signalling an in-
terrupt request. IST[31:16] correspond to
IRQ16
CVSD/PCM Converter
IRQ31 to IRQ16, respectively.
0 – Interrupt is not active.
IRQ15
ACCESS.bus Interface
1 – Interrupt is active.
IRQ14
TA (Timer input A)
IRQ13
TB (Timer input B)
IRQ12
VTUA (VTU Interrupt Request 1)
IRQ11
VTUB (VTU Interrupt Request 2)
IRQ10
VTUC (VTU Interrupt Request 3)
IRQ9
VTUD (VTU Interrupt Request 4)
IRQ8
Microwire/SPI Rx/Tx
IRQ7
UART Tx
IRQ6
UART CTS
IRQ5
MIWU Interrupt 0
IRQ4
MIWU Interrupt 1
IRQ3
MIWU Interrupt 2
IRQ2
MIWU Interrupt 3
IRQ1
Flash Program/Data Memory
IRQ0
Reserved
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