28.13.7 Ctl Input Section - Renesas Hitachi H8S/2194 Series Hardware Manual

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.
AMPON
(PB-CTL)
– +
CTL(-) CTL(+)
Rev. 2.0, 11/00, page 766 of 1037
AMPSHORT
(REC-CTL)
+
–
CTLREF CTLBias
Note : Be sure to set a capacitor between CTLAmp (o) and CTLSMT (i).
Figure 28.52 Block Diagram of CTL Input Section
CTLGR3 to 1
–
+
CTLFB CTLAmp(o)
CTLFB CTLGR0
PB-CTL(+)
PB-CTL(-)
CTLSMT(i)
Note