ATA5771_09 ATMEL [ATMEL Corporation], ATA5771_09 Datasheet - Page 171
ATA5771_09
Manufacturer Part Number
ATA5771_09
Description
Microcontroller with UHF ASK/FSK Transmitter
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.ATA5771_09.pdf
(287 pages)
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14.11.7
14.11.8
118
ATtiny24/44/84
ICR1H and ICR1L – Input Capture Register 1
TIMSK1 – Timer/Counter Interrupt Mask Register 1
The Input Capture is updated with the counter (TCNT1) value each time an event occurs on the
ICP1 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.
• Bit 7,6,4,3 – Reserved Bit
This bit is reserved for future use. For ensuring compatibility with future devices, this bit must be
written to zero when the register is written.
• Bit 5 – ICIE1: Timer/Counter1, 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 66.) is executed when the
ICF1 Flag, located in TIFR1, is set.
• Bit 2– OCIE1B: Timer/Counter1, Output Compare B 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/Counter1 Output Compare B Match interrupt is enabled. The corresponding
Interrupt Vector (see
TIFR1, is set.
• Bit 1– OCIE1A: Timer/Counter1, Output Compare A 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/Counter1 Output Compare A Match interrupt is enabled. The corresponding
Interrupt Vector (see
TIFR1, is set.
• Bit 0 – TOIE1: Timer/Counter1, Overflow Interrupt Enable
When this bit is written to one, and the I-flag in the Status Register is set (interrupts globally
enabled), the Timer/Counter1 Overflow interrupt is enabled. The corresponding Interrupt Vector
(see
Bit
0x25 (0x45)
0x24 (0x44)
Read/Write
Initial Value
Bit
0x0C (0x2C)
Read/Write
Initial Value
”Interrupts” on page
”Accessing 16-bit Registers” on page
R/W
R
7
0
7
–
0
”Interrupts” on page
”Interrupts” on page
R/W
50) is executed when the TOV1 flag, located in TIFR1, is set.
6
0
R
6
–
0
R/W
ICIE1
R/W
5
0
5
0
R/W
50) is executed when the OCF1B flag, located in
50) is executed when the OCF1A flag, located in
4
0
R
4
–
0
ICR1[15:8]
ICR1[7:0]
94.
R/W
3
0
R
3
–
0
OCIE1B
R/W
R/W
2
0
2
0
OCIE1A
R/W
R/W
1
0
1
0
R/W
TOIE1
R/W
0
0
0
0
7701C–AVR–12/08
TIMSK1
ICR1H
ICR1L
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