h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 209

• Manufacturer Part Number: h8s-2111b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

9.5.8
The FRC overflow flag (OVF) is set to 1 when FRC overflows (changes from H'FFFF to H'0000).
Figure 9.13 shows the timing of setting the OVF flag.
9.5.9
When the OCRAMS bit in TOCR is set to 1, the contents of OCRAR and OCRAF are
automatically added to OCRA alternately, and when an OCRA compare-match occurs a write to
OCRA is performed. Figure 9.14 shows the OCRA write timing.
φ
FRC
OCRA
OCRAR, OCRAF
Compare-match
signal
Timing of FRC Overflow Flag Setting
Automatic Addition Timing
φ
FRC
Overflow signal
OVF
Figure 9.13 Timing of Overflow Flag (OVF) Setting
Figure 9.14 OCRA Automatic Addition Timing
N
N
H'FFFF
A
H'0000
Rev. 1.00, 05/04, page 175 of 544
N +1
N + A