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Rev. 2.0, 11/00, page 687 of 1037
Bits 7 and 6: Clock Source Selection Bits (DFCS1, DFCS0)
DFCS1 and DFCS0 select the clock to be supplied to the counter. (
φ
s = fosc/2)
Bit 7
Bit 6
DFCS1
DFCS0
Description
0
φ
s
(Initial value)
0
1
φ
s/2
0
φ
s/4
1
1
φ
s/8
Bit 5: Counter Overflow Flag (DFOVF)
The DFOVF flag indicates the overflow of the 16-bit counter. It is cleared by writing 0. Write 0
after reading 1. Also, setting has the highest priority in this flag. If a flag set and 0 write occurs
simultaneously, the latter is nullified.
Bit 5
DFOVF
Description
0
Normal state
(Initial value)
1
Indicates that overflow has occurred in the counter
Bit 4: Error Data Limit Function Selection Bit (DFRFON)
Makes the error data limit function valid. (Limit values are the values set in the lock range data
register (DFRUDR, DFRLDR)).
Bit 4
DFRFON
Description
0
Limit function off
(Initial value)
1
Limit function on
Bit 3: Drum Lock Flag (DF-R/UNR)
Sets a flag if an underflow occurred in the drum lock counter.
Bit 3
DF-R/UNR
Description
0
Indicates that the drum speed system is not locked
(Initial value)
1
Indicates that the drum speed system is locked
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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