Rev. 1.00, 05/04, page 177 of 544
9.6 Interrupt
Sources
The free-running timer can request seven interrupts: ICIA to ICID, OCIA, OCIB, and FOVI. Each
interrupt can be enabled or disabled by an enable bit in TIER. Independent signals are sent to the
interrupt controller for each interrupt. Table 9.2 lists the sources and priorities of these interrupts.
Table 9.2
FRT Interrupt Sources
Interrupt Interrupt
Source
Interrupt Flag
Priority
ICIA
Input capture of ICRA
ICFA
High
ICIB
Input capture of ICRB
ICFB
ICIC
Input capture of ICRC
ICFC
ICID
Input capture of ICRD
ICFD
OCIA
Compare match of OCRA
OCFA
OCIB
Compare match of OCRB
OCFB
FOVI
Overflow of FRC
OVF
Low
9.7 Usage
Notes
9.7.1
Conflict between FRC Write and Clear
If an internal counter clear signal is generated during the state after an FRC write cycle, the clear
signal takes priority and the write is not performed. Figure 9.17 shows the timing for this type of
conflict.
φ
Address
FRC address
Internal write
signal
Counter clear
signal
FRC
N
H'0000
T
1
T
2
Write cycle of FRC
Figure 9.17 FRC Write-Clear Conflict
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