Renesas Hitachi H8S/2194 Series Hardware Manual page 671

Figures 28.16 and 28.17 show REF30 (REF30P) when PB is switched to REC.
Field signal
VD (except in PB)
Selected VD *
(OD/EV=0)
REC/PB
Value set in reference
period register 1 (RFD)
Counter
Value set in REF30
counter register (RFC)
Toggle mask
Counter mask
(Clear signal mask)
REF30
REF30P
* When in the field discrimination mode
Figure 28.16 Generation of the Reference Signal when PB is Switched to REC (1)
Rev. 2.0, 11/00, page 644 of 1037
PB
Cleared Cleared
Masking
period
Masking
period
About 75%
Cleared
REC(ASM)
Cleared Cleared