Fujitsu FR60 Hardware Manual page 497

External request input is valid only for ch0, 1, and 2. External request input cannot be selected for ch3 and
4. Whether level detection or edge detection is used is determined by the mode setting. (Level detection is
selected for demand transfer. For all other cases, edge detection is selected.)
When the transfer factor of external interrupt 0 to 2 and A/D interrupt is selected, it is not possible to use it
on the condition that the setting of CPU clock and peripheral clock by (DIVR0) of Base Clock Division
Setting Register shows in the following.
Dividing frequency ratio of CPU clock
CLKB dividing frequency ratio = 1
CLKB dividing frequency ratio = 2
CLKB dividing frequency ratio = 3
CLKB dividing frequency ratio = 4
CLKB dividing frequency ratio = 5
Dividing frequency ratio of Peripheral clock
CLKP dividing frequency ratio > 3
CLKP dividing frequency ratio > 6
CLKP dividing frequency ratio > 9
CLKP dividing frequency ratio > 12
CLKP dividing frequency ratio > 15
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