Rev. 1.0, 02/00, page 668 of 1141
Drum System Digital Filter Control Register (DFIC)
0
0
1
0
R/W
2
0
R/W
3
0
4
0
R/W
5
0
6
0
7
—
—
R/W
R/W
R/(W)
DPHA
R/(W)*
DROV
DZPON
DZSON
DSG2
DSG1
DSG0
1
Note: * Only 0 can be written
Bit :
Initial value :
R/W :
DFIC is an 8-bit read/write register that controls the status of the drum digital filter and operating
mode. Only a byte access is valid. If a word access is attempted, correct operation is not
guaranteed. DFIC is initialized to H'80 by a reset, and in standby mode and module stop mode.
Bit 7
Reserved: Cannot be modified and is always read as 1.
Bit 6
Drum System Range Over Flag (DROV): This flag is set to 1 when the result of a filter
computation exceeds 12 bits in width. To clear this flag, write 0 after reading 1.
Bit 6
DROV
Description
0
Indicates that the filter computation result did not exceed 12 bits
(Initial value)
1
Indicates that the filter computation result exceeded 12 bits
Bit 5
Drum Phase System Filter Computation Start Bit (DPHA): Starts or stops filter
processing for drum phase system.
Bit 5
DPHA
Description
0
Phase system filter computations are disabled
Phase computation result (Y) is not added to Es (see figure 26.34)
(Initial value)
1
Phase system filter computations are enabled