atmega163l ATMEL Corporation, atmega163l Datasheet - Page 50

• Manufacturer Part Number: atmega163l
• Description: Atmega163 8-bit Avr Microcontroller With 16k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

50
ATmega163(L)
Figure 35. Effects of Unsynchronized OCR1 Latching.
Figure 36. Effects of Unsynchronized OCR1 Latching in Overflow Mode.
During the time between the write and the latch operation, a read from OCR1A or
OCR1B will read the contents of the temporary location. This means that the most
recently written value always will read out of OCR1A/B.
When the OCR1X contains $0000 or TOP, and the up/down PWM mode is selected, the
output OC1A/OC1B is updated to low or high on the next Compare Match according to
the settings of COM1A1/COM1A0 or COM1B1/COM1B0. This is shown in Table 18. In
overflow PWM mode, the output OC1A/OC1B is held low or high only when the Output
Compare Register contains TOP.
Table 18. PWM Outputs OCR1X = $0000 or TOP
Note:
COM1X1
Note: x = A or B
1. X = A or B
1
1
1
1
Note: X = A or B
Unsynchronized OC1x Latch
Synchronized OC1x Latch
Synchronized OC1x Latch
Unsynchronized OC1x Latch
COM1X0
0
0
1
1
OCR1X
$0000
$0000
TOP
TOP
(1)
PWM Output OC1x
PWM Output OC1x
PWM Output OC1x
PWM Output OC1x
Output OC1X
H
H
L
L
1142E–AVR–02/03