Rev. 2.0, 11/00, page 793 of 1037
28.14.4
DFG Noise Removal Circuit
(1) Block Diagram
Figure 28.70 shows the block diagram of the DFG noise removal circuit.
Edge
detection
Delay circuit
DFG
S
Q
R
NCDFG
delay = 2
Edge
detection
Figure 28.70 DFG Noise Removal Circuit
(2) Register Descriptions
•
Register configuration
Table 28.24 shows the register configuration of the DFG mask circuit.
Table 28.24 Register Configuration
Name
Abbrev.
R/W
Size
Initial Value
Address
FG control register
FGCR
W
Byte
H'FE
H'FD09E
•
FG Control Register (FGCR)
0
0
1
1
2
1
3
1
4
1
5
1
6
1
7
—
—
—
—
—
—
—
—
—
—
—
—
—
—
W
DRF
1
Bit :
Initial value :
R/W :
Selects the edge of the DFG noise removal signal (NCDFG) to be sent to the drum speed error
detector. If a read is attempted, an undetermined value is read out. Bits 7 to 1 are reserved. No
write in them is valid.
It is initialized to H'FE by a reset, stand-by or module stop.
The edge selection circuit is located in the drum speed error detector, and outputs the register
output to the drum speed error detector.
Bits 7 to 1: Reserved
No write in them is valid. If a read is attempted, an undetermined value is read out.
Содержание Hitachi H8S/2191
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Страница 639: ...Rev 2 0 11 00 page 612 of 1037 28 1 2 Block Diagram Figure 28 1 shows a block diagram of the servo circuits...
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