SAF82526 INFINEON [Infineon Technologies AG], SAF82526 Datasheet - Page 83
SAF82526
Manufacturer Part Number
SAF82526
Description
Data Communications ICs
Manufacturer
INFINEON [Infineon Technologies AG]
Datasheet
1.SAF82526.pdf
(126 pages)
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EXA … Extended Interrupt of Channel A (Channel B only)
Note:
Mask Register (WRITE)
MASK
Value after RESET: 00
Each interrupt source can be selectively masked by setting the respective bit in MASK (bit
positions corresponding to ISTA register). Masked interrupts are not indicated when reading
ISTA. Instead, they remain internally stored and will be indicated after the respective MASK bit
is reset.
Note:
Semiconductor Group
An interrupt is caused by channel B and source(s) is (are) indicated in the EXIR register of
channel B.
After the respective register has been read, EXA, and EXB are reset. All other bits will be
reset after reading ISTA. To prevent malfunctions, each bit is individually monitored and
reset.
To generate edges at the INT pin it is necessary to mask all interrupts at the end of the
interrupt service routine and write back the old mask to the mask register.
The ICA, EXA, and EXB bit are present in channel B only and point to the ISTA (CHA),
EXIR (CHA), and EXIR (CHB) registers.
After the HSCX has requested an interrupt by turning its INT pin to low, the CPU must
first read the ISTA register of channel B and check the state of these bits in order to
determine which interrupt source(s) of which channel(s) has caused the interrupt. More
than one interrupt source may be indicated by a single interrupt request.
In the event of an extended interrupt, no interrupt request will be generated with a
masked EXA, EXB bit, although this bit is set in ISTA.
7
RME
H
RPF
(all interrupts enabled)
RSC
XPR
83
TIN
ICA
EXA
EXB
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