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132
8018P–AVR–08/10
ATmega169P
FOC1A/FOC1B bits are implemented as strobes. Therefore it is the value present in the
COM1x1:0 bits that determine the effect of the forced compare.
A FOC1A/FOC1B strobe will not generate any interrupt nor will it clear the timer in Clear Timer
on Compare match (CTC) mode using OCR1A as TOP.
The FOC1A/FOC1B bits are always read as zero.
15.11.4
TCNT1H and TCNT1L – Timer/Counter1
The two Timer/Counter I/O locations (TCNT1H and TCNT1L, combined TCNT1) give direct
access, both for read and for write operations, to the Timer/Counter unit 16-bit counter. To
ensure that both the high and low bytes are read and written 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
Modifying the counter (TCNT1) while the counter is running introduces a risk of missing a com-
pare match between TCNT1 and one of the OCR1x Registers.
Writing to the TCNT1 Register blocks (removes) the compare match on the following timer clock
for all compare units.
15.11.5
OCR1AH and OCR1AL – Output Compare Register 1 A
15.11.6
OCR1BH and OCR1BL – Output Compare Register 1 B
The Output Compare Registers contain a 16-bit value that is continuously compared with the
counter value (TCNT1). A match can be used to generate an Output Compare interrupt, or to
generate a waveform output on the OC1x pin.
The Output Compare Registers are 16-bit in size. To ensure that both the high and low bytes are
written simultaneously when the CPU writes to 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 109.
Bit
765
432
10
(0x85)
TCNT1[15:8]
TCNT1H
(0x84)
TCNT1[7:0]
TCNT1L
Read/Write
R/W
Initial Value
0
Bit
765
432
10
(0x89)
OCR1A[15:8]
OCR1AH
(0x88)
OCR1A[7:0]
OCR1AL
Read/Write
R/W
Initial Value
0
Bit
765
432
10
(0x8B)
OCR1B[15:8]
OCR1BH
(0x8A)
OCR1B[7:0]
OCR1BL
Read/Write
R/W
Initial Value
0
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