Servo Port; Overview; Block Diagram - Renesas Hitachi H8S/2194 Series Hardware Manual

28.2

Servo Port

28.2.1

Overview

This LSI is equipped with seventeen pins dedicated to servo module and twenty-five dual-
purpose pins used also for general-purpose port. It has also built-in input amplifier to amplify
CTL signals, CTL output amplifier, CTL Schmitt comparator, and CFG zero cross type
comparator. The CTL input amplifier allows gain adjustment by software. DFG and DPG
signals, which are the signals to control the drum, allow selection between separate or overlap
input.
SV1 and SV2 pins allow to output to monitor the inside signals of the servo section. The signals
to be output can be selected out of eight kinds of signals. See section 28.2.5 (4), Servo Monitor
Control Register (SVMCR).
28.2.2

Block Diagram

(1) DFG and DPG input circuits
The DFG and DPG input pins have on-chip Schmitt circuits. Figure 28.2 shows the input
circuits of DFG and DPG.
DFG
DPG
Rev. 2.0, 11/00, page 614 of 1037
DPG SW
Figure 28.2 Input Circuits of DFG and DPG
DPG SW
DFG
DPG
RES+LPM