HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 541

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

12.5
There are four FRT interrupt sources of three types (ICI, OCIA/OCIB, and OVI). Table 12.3 lists
the interrupt sources and their priorities after a reset is cleared. The interrupt enable bits in TIER
are used to enable or disable the interrupt bits. Each interrupt request is sent to the interrupt
controller independently. See section 5, Interrupt Controller (INTC), for more information about
priorities and the relationship to interrupts other than those of the FRT.
Table 12.3 FRT Interrupt Sources and Priorities
Interrupt Source
ICI
OCIA, OCIB
OVI
12.6
Figure 12.13 shows an example in which pulses with a 50% duty factor and arbitrary phase
relationship are output. The procedure is as follows:
1. Set the CCLRA bit in FTCSR to 1.
2. The OLVLA and OLVLB bits are inverted by software whenever a compare match occurs.
526
H'FFFF
H'0000
OCRA
OCRB
FTOA
FTOB
Interrupt Sources
Example of FRT Use
Figure 12.13 Example of Pulse Output
FRC
Description
Interrupt by ICF
Interrupt by OCFA or OCFB
Interrupt by OVF
Counter clear
Priority
High
Low