參數(shù)資料
型號(hào)： R5F6418JADFE
元件分類： 微控制器/微處理器
英文描述： MICROCONTROLLER, PQFP176
封裝： 24 X 24 MM, 0.50 MM PITCH, PLASTIC, LQFP-176
文件頁數(shù)： 32/128頁
文件大小： 922K
代理商： R5F6418JADFE
129
ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
18.5.3 Using the Output Compare Unit
Since writing TCNT2 in any mode of operation will block all compare matches for one timer clock cycle, there are risks
involved when changing TCNT2 when using the output compare channel, independently of whether the Timer/Counter is
running or not. If the value written to TCNT2 equals the OCR2x value, the compare match will be missed, resulting in
incorrect waveform generation. Similarly, do not write the TCNT2 value equal to BOTTOM when the counter is
downcounting.
The setup of the OC2x should be performed before setting the data direction register for the port pin to output. The easiest
way of setting the OC2x value is to use the force output compare (FOC2x) strobe bit in normal mode. The OC2x register
keeps its value even when changing between waveform generation modes.
Be aware that the COM2x1:0 bits are not double buffered together with the compare value. Changing the COM2x1:0 bits will
take effect immediately.
18.6
Compare Match Output Unit
The compare output mode (COM2x1:0) bits have two functions. The waveform generator uses the COM2x1:0 bits for
defining the output compare (OC2x) state at the next compare match. Also, the COM2x1:0 bits control the OC2x pin output
source. Figure 18-4 shows a simplified schematic of the logic affected by the COM2x1:0 bit setting. The I/O registers,
I/O bits, and I/O pins in the figure are shown in bold. Only the parts of the general I/O port control registers (DDR and PORT)
that are affected by the COM2x1:0 bits are shown. When referring to the OC2x state, the reference is for the internal OC2x
register, not the OC2x pin.
Figure 18-4. Compare Match Output Unit, Schematic
The general I/O port function is overridden by the output compare (OC2x) from the waveform generator if either of the
COM2x1:0 bits are set. However, the OC2x pin direction (input or output) is still controlled by the data direction register
(DDR) for the port pin. The data direction register bit for the OC2x pin (DDR_OC2x) must be set as output before the OC2x
value is visible on the pin. The port override function is independent of the waveform generation mode.
The design of the output compare pin logic allows initialization of the OC2x state before the output is enabled. Note that
some COM2x1:0 bit settings are reserved for certain modes of operation.
DA
T
A
BUS
0
1
Q
D
COMnx1
COMnx0
FOCnx
OCnx
Waveform
Generator
Q
D
PORT
Q
D
DDR
OCnx
Pin
clkI/O
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