26.13.7 Ctl Input Section - Hitachi H8S/2199 Hardware Manual

26.13.7 CTL Input Section

The CTL input section consists of an input amplifier of which gain can be controlled by the
register setting and a Schmitt amplifier. Figure 26.52 shows a block diagram of the CTL input
section.
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 the Timer
L as the PB-CTL signal. Control the CTL input amplifier gain by bits 3 to 0 in CTL gain control
register (CTLGR) of the servo port.
AMPON
(PB-CTL)
Ð +
CTL(-) CTL(+)
Rev. 1.0, 02/00, page 704 of 1141
AMPSHORT
(REC-CTL)
+
Ð
CTLREF CTLBias
Note : Be sure to set a capacitor between CTLAmp (o) and CTLSMT (i).
Figure 26.52 Block Diagram of CTL Input Amplifier
CTLGR3 to 1
Ð
+
CTLFB CTLAmp(o)
CTLFB CTLGR0
PB-CTL(+)
PB-CTL(-)
CTLSMT(i)
Note