PFS122
8bit MTP MCU with 12-bit R-Type ADC
9.2.5. TIMER time out
When select $ INTEGS BIT_R (default value) and T16M counter BIT8 to generate interrupt, if T16M counts
from 0, the first interrupt will occur when the counter reaches to 0x100 (BIT8 from 0 to 1) and the second
interrupt will occur when the counter reaches 0x300 (BIT8 from 0 to 1). Therefore, selecting BIT8 as 1 to
generate interrupt means that the interrupt occurs every 512 counts. Please notice that if T16M counter is
restarted, the next interrupt will occur once Bit8 turns from 0 to 1.
If select $ INTEGS BIT_F(BIT triggers from 1 to 0) and T16M counter BIT8 to generate interrupt, the T16M
counter changes to an interrupt every 0x200/0x400/0x600/. Please pay attention to two differences with
setting INTEGS methods.
9.2.6. IHRC
(1) The IHRC frequency calibration is performed when IC is programmed by the writer.
(2) Because the characteristic of the Epoxy Molding Compound (EMC) would some degrees affects the
IHRC frequency (either for package or COB), if the calibration is done before molding process, the actual
IHRC frequency after molding may be deviated or becomes out of spec. Normally , the frequency is
getting slower a bit.
(3) It usually happens in COB package or Quick Turnover Programming (QTP). And PADAUK would not
take any responsibility for this situation.
(4) Users can make some compensatory adjustments according to their own experiences. For example,
users can set IHRC frequency to be 0.5% ~ 1% higher and aim to get better re-targeting after molding.
9.2.7. LVR
User can set MISC.2 as “1” to disable LVR. However, VDD must be kept as exceeding the lowest working
voltage of chip; Otherwise IC may work abnormally.
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PDK-DS-PFS122-EN_V000-May 28, 2020
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