Hitachi F-ZTAT H8/3039 Series Hardware Manual page 262

GRA3
GR
H'0000
BR
GR
Figure 8-39 Changing a General Register Setting by Buffer Transfer (Example 1)
 Buffer transfer at transition from up-counting to down-counting
If the general register value is in the range from GRA3 – T + 1 to GRA3, do not transfer a
buffer register value outside this range. Conversely, if the general register value is outside
this range, do not transfer a value within this range. See figure 8-40.
GRA3 + 1
GRA3
GRA3 – T + 1
GRA3 – T
Figure 8-40 Changing a General Register Setting by Buffer Transfer (Caution 1)
252
Not allowed
Illegal changes
TCNT3
TCNT4