h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 348

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 11 16-Bit Free-Running Timer
11.3.7
The FRC overflow flag (OVF) is set to 1 when FRC overflows (changes from H'FFFF to H'0000).
Figure 11.13 shows the timing of this operation.
11.3.8
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. The OCRA write timing is shown in figure 11.14.
Rev. 4.00 Jun 06, 2006 page 294 of 1004
REJ09B0301-0400
FRC
OCRA
OCRAR, F
Compare-match
signal
Setting of FRC Overflow Flag (OVF)
Automatic Addition of OCRA and OCRAR/OCRAF
FRC
Overflow signal
OVF
Figure 11.14 OCRA Automatic Addition Timing
Figure 11.13 Setting of Overflow Flag (OVF)
N
N
H'FFFF
A
N+A
N+1
H'0000