Renesas Hitachi H8S/2194 Series Hardware Manual page 663

(3) Timing of the REF30 Signal Generation
Figures 28.8, 28.9, 28.10, 28.11 and 28.12 show the timing of the generation of REF30 and
REF30P signals.
Value set in reference
period register 1 (RFD)
Counter
Value set in REF30
counter register (RFC)
REF30
REF30P
Rev. 2.0, 11/00, page 636 of 1037
Counter set
Figure 28.8 REF30 Signals in Playback Mode
Counter set Counter set