Rev. 2.0, 11/00, page 766 of 1037
28.13.7
CTL Input Section
The CTL input section consists of an input amplifier whose gain can be controlled by register
setting and a Schmitt amplifier. Figure 28.52 shows a block diagram of the CTL input section.
A trivial CTL pulse signal is received from the CTL head, amplified by the input amplifier,
reshaped into a square wave by the Schmitt amplifier, and sent to the servo circuits and timer L
as the PB-CTL signal. Control the CTL input amplifier gain by bits 3 to 0 in the CTL gain
control register (CTLGR) of the servo port.
–
+
+
–
CTLFB
CTLSMT(i)
CTLFB
CTLREF
CTLBias
CTLGR0
CTLGR3 to 1
AMPSHORT
(REC-CTL)
PB-CTL(+)
Note : Be sure to set a capacitor between CTLAmp (o) and CTLSMT (i).
Note
PB-CTL(-)
AMPON
(PB-CTL)
– +
CTLAmp(o)
CTL(+)
CTL(-)
Figure 28.52 Block Diagram of CTL Input Section
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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