NXP Semiconductors MPC5644A, Reference Manual, Page: 1180 / 1735

Decimation Filter
MPC5644A Microcontroller Reference Manual, Rev. 6
1180 Freescale Semiconductor
ODEN
8
Output Data Interrupt Enable. The ODEN bit enables the Decimation Filter to generate interrupt
requests on all new data written to the filter Output buffer. It is independent of how ISEL and
MIXM are set.
1 Output Data Interrupt Enabled
0 Output Data Interrupt Disabled
ERREN
9
Error Interrupt Enable. The ERREN bit enables the Decimation Filter to generate interrupt
requests based on the assertion of the DECFILTER_MSR error flags OVF, DIVR, SVR, OVR or
IVR.
1 Error Interrupts Enabled
0 Error Interrupts Disabled
10 Reserved, should be cleared.
FTYPE[1:0]
11–12
Filter Type Selection bits. The FTYPE[1:0] bits select the filter type according to Table 26-6 .
Note: Bypass must not be configured in cascade mode (see field CASCD).
13 Reserved, should be cleared.
14–15
SCAL[1:0]
Filter Scaling Factor. The SCAL[1:0] bit field selects the scaling factor used by the filter algorithm
according to
Table 26-7 .
Table 26-4. DECFILTER_MCR Register Field Descriptions (continued)
Field Description
Table 26-6. FTYPE[1:0] – Filter type selection
FTYPE[1:0] Description
00 Filter Bypass
1
1
In Bypass configuration the filter is disabled.
01 IIR Filter - 1 x 4th order
10 FIR Filter - 1 x 8th order
11 reserved
Table 26-7. SCAL[1:0] – Filter scaling factor definition
SCAL[1:0] Description
00 Scaling Factor = 1
01 Scaling Factor = 4
10 Scaling Factor = 8
11 Scaling Factor = 16