142
7679H–CAN–08/08
AT90CAN32/64/128
13.11.15 Input Capture Register – ICR1H and ICR1L
13.11.16 Input Capture Register – ICR3H and ICR3L
The Input Capture is updated with the counter (TCNTn) value each time an event occurs on the
ICPn pin (or optionally on the Analog Comparator output for Timer/Counter1). The Input Capture
can be used for defining the counter TOP value.
The Input Capture Register is 16-bit in size. To ensure that both the high and low bytes are read
simultaneously when the CPU accesses these registers, the access is performed using an 8-bit
temporary high byte register (TEMP). This temporary register is shared by all the other 16-bit
registers. See “Accessing 16-bit Registers” on page 116.
13.11.17 Timer/Counter1 Interrupt Mask Register – TIMSK1
13.11.18 Timer/Counter3 Interrupt Mask Register – TIMSK3
• Bit 7..6 – Reserved Bits
These bits are reserved for future use.
• Bit 5 – ICIEn: Input Capture Interrupt Enable
When this bit is written to one, and the I-flag in the Status Register is set (interrupts globally
enabled), the Timer/Countern Input Capture interrupt is enabled. The corresponding Interrupt
Vector (See “Interrupts” on page 60.) is executed when the ICFn flag, located in TIFRn, is set.
• Bit 4 – Reserved Bit
This bit is reserved for future use.
• Bit 3 – OCIEnC: Output Compare C Match Interrupt Enable
When this bit is written to one, and the I-flag in the Status Register is set (interrupts globally
enabled), the Timer/Countern Output Compare C Match interrupt is enabled. The corresponding
Interrupt Vector (See “Interrupts” on page 60.) is executed when the OCFnC flag, located in
TIFRn, is set.
Bit 76543210
ICR1[15:8] ICR1H
ICR1[7:0] ICR1L
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial Value00000000
Bit 76543210
ICR3[15:8] ICR3H
ICR3[7:0] ICR3L
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial Value00000000
Bit 76543210
– – ICIE1 – OCIE1C OCIE1B OCIE1A TOIE1 TIMSK1
Read/Write R R R/W R R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0
Bit 76543210
– – ICIE3 – OCIE3C OCIE3B OCIE3A TOIE3 TIMSK3
Read/Write R R R/W R R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0
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