Table 122. Siul2_Ifmcr0 Field Descriptions - STMicroelectronics SPC572L series Reference Manual

System Integration Unit Lite2 (SIUL2)
Field
Maximum Interrupt Filter Counter setting
MAXCNTx can be 0 to 15
For MAXCNTx = 0, 1, 2, the filter behaves as ALL PASS filter
For MAXCNTx = 3, 4, 5, ... 15, filter period = TCK*MAXCNTx + n*TCK
(n = -1 to 3)
TCK: Prescaled filter clock period, which is IRC clock prescaled to IFCP value, specified in
28–31
SIUL2_IFCPR
MAXCNTx
TIRC: Basic filter clock period 62.5 ns (f = 16 MHz)
Note that filter delay is 2 TCK clock cycles more than filter period.
T(DELAY) = (1 to 5)*TCK + MAXCOUNT * TCK.
The SW is to expect the worst filter delay value.
In general, TFILTER and TDELAY are not integer multiples of TCK because DIN
is asynchronous whereas DOUT is synchronous with respect to the CK clock, and the factor n
accounts for this uncertainty in filter period calculation.
13.2.2.10 SIUL2 Interrupt Filter Clock Prescaler Register (SIUL2_IFCPR)
This register is used to configure a clock prescaler which is used to select the clock for all
digital filters. Prescaler is applied to the input clock to the SIUL2, which is the system
PBRIDGE clock counters in the
Address: 0x00C0
0 1 2 3 4
R 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Figure 63. SIUL2 Interrupt Filter Clock Prescaler Register (SIUL2_IFCPR)
Field
Interrupt Filter Clock Prescaler setting
28–31 Prescaled Filter Clock Period = T(IRC) x (IFCP + 1)
IFCP T(IRC) is the internal oscillator period.
IFCP can be 0 to 15
13.2.2.11 SIUL2 Multiplexed Signal Configuration Registers (SIUL2_MSCR0–
SIUL2_MSCR1023)
The MSCRs control the I/O pin function and electrical properties for each pin on the device,
and are used to select the input signal for IP blocks on the device that have multiple input
sources. There is a dedicated MSCR for each I/O pin on the device. Each MSCR is
296/2058

Table 122. SIUL2_IFMCR0 field descriptions

SIUL2.Section 21.6: Peripheral clocks
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Table 123. SIUL2_IFCPR field descriptions
DocID027809 Rev 4
Description
Description
RM0400
Access: User read/write
IFCP[3:0]