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Rev. 2.0, 11/00, page 764 of 1037
VD
DVCFG2
REF30X
16bit
UP/DOWN
counter
HSW
CTL
Tx
Latch
Preset
The X-value is updated by REF30P. Modification of XDR must be performed
before REF30P in the cycle in which the X-value is changed.
X-value
X-value
after
change
RCDR3
RCDR1
RCDR2
REF30P
Ta
PB-CTL
Tb
1 pulse
UDF
0 pulse
0 pulse
CDIVR2
Register write
Ta is the interval calculated from RDCR3.
Tb is the interval in which switchover is performed
from ASM mode to REC mode.
Tx is the cycle in which the REF30X period is
shortened due to the change of XDR.
1 pulse
X-value (XDR) is
rewritten in this
cycle
RCDR1
Capstan phase control
ASM mode, PB mode : REF30X-PB-CTL
REC mode : REF30P-DVCFG2
/4
/5
/4
REC-CTL
Figure 28.50 Example of CTLM Switchover Timing
(When Phase Control is Performed by REF30P and DVCFG2 in REC Mode)
Содержание Hitachi H8S/2191
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