Ctl Circuit; 28.13.1 Overview - Renesas Hitachi H8S/2194 Series Hardware Manual

28.13

CTL Circuit

28.13.1 Overview

The CTL circuit includes a Schmitt amplifier that amplifies and reshapes the CTL input, then
outputs it as the PB-CTL signal to the servo, linear time counter, and other circuits.
The PB-CTL signal is also sent to a duty discriminator in the CTL circuit that detects and
records VISS, ASM, and VASS marks. A REC-CTL amplifier is included in the record circuits.
Detection and recording whether the CTL pulse pattern is long or short can also be enabled to
correspond to the wide-aspect.
The following operating modes can be selected by settings in the CTL mode register:
• Duty discrimination
VISS detect, ASM detect, VASS detect, L/S bit pattern detect
• CTL record
VISS record, ASM record, VASS record, L/S bit pattern detect
• Rewrite
Trapezoid waveform generator
Rev. 2.0, 11/00, page 746 of 1037