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Rev. 1.00, 05/04, page 159 of 544
9.2 Input/Output Pins
Table 9.1 lists the FRT input and output pins.
Table 9.1 Pin Configuration
Name Abbreviation I/O Function
Counter clock input pin FTCI Input FRC counter clock input
Output compare A output pin FTOA Output Output compare A output
Output compare B output pin FTOB Output Output compare B output
Input capture A input pin FTIA Input Input capture A input
Input capture B input pin FTIB Input Input capture B input
Input capture C input pin FTIC Input Input capture C input
Input capture D input pin FTID Input Input capture D input
9.3 Register Descriptions
The FRT has the following registers.
• Free-running counter (FRC)
• Output compare register A (OCRA)
• Output compare register B (OCRB)
• Input capture register A (ICRA)
• Input capture register B (ICRB)
• Input capture register C (ICRC)
• Input capture register D (ICRD)
• Output compare register AR (OCRAR)
• Output compare register AF (OCRAF)
• Output compare register DM (OCRDM)
• Timer interrupt enable register (TIER)
• Timer control/status register (TCSR)
• Timer control register (TCR)
• Timer output compare control register (TOCR)
Note: OCRA and OCRB share the same address. Register selection is controlled by the OCRS
bit in TOCR. ICRA, ICRB, and ICRC share the same addresses with OCRAR, OCRAF,
and OCRDM. Register selection is controlled by the ICRS bit in TOCR.