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Rev. 2.0, 11/00, page 730 of 1037
(5) 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 readable/writable register that controls the status of the drum system digital
filter and operating mode. It can be accessed by byte access only. Word access gives unassured
results.
Bit 7 is a reserved bit. Writes are disabled. If read is attempted, an undetermined value is read
out. DFIC is initialized to H'80 by a reset, and in standby mode and module stop mode.
Bit 7: Reserved
Reads and writes are both disabled.
Bit 6: Drum System Range Over Flag (DROV)
This flag is set to 1 when the result of a drum system filter computation exceeds 12 bits in width.
To clear this flag, write 0.
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 the 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 28.39)
(Initial value)
1
Phase system filter computations are enabled
Содержание Hitachi H8S/2191
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