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Rev. 2.0, 11/00, page 765 of 1037
VD
CREF
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
0 pulse
0 pulse
ASM-REC
switchover
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.
With CREF and DVCFG2
phase alignment, the
frequency need not be 25 Hz
or 30 Hz.
1 pulse
X-value (XDR) is
rewritten in this
cycle
DVCFG2
RCDR1
Capstan phase control
ASM mode, PB mode: REF30X-PB-CTL
Capstan phase control
REC mode : REF30P-DVCFG2
/4
/5
/4
REC-CTL
CDIVR2
Register write
UDF
Figure 28.51 Example of CTLM Switchover Timing
(When Phase Control is Performed by CREF and DVCFG2 in REC Mode)
Содержание Hitachi H8S/2191
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