ATA5771-DK1 Atmel, ATA5771-DK1 Datasheet - Page 105

• Manufacturer Part Number: ATA5771-DK1
• Description: BOARD XMITTER FOR ATA5771 868MHZ
• Manufacturer: Atmel
• Type: Transmitterr

Specifications of ATA5771-DK1

• Frequency: 868MHz
• Maximum Frequency: 868 MHz
• Supply Voltage (max): 4 V
• Supply Voltage (min): 2 V
• Supply Current: 8.5 mA
• Product: RF Development Tools
• For Use With/related Products: ATA5771
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.16.8
9137E–RKE–12/10
Compare Match Output Unit
Be aware that the COM1x1:0 bits are not double buffered together with the compare value.
Changing the COM1x1:0 bits will take effect immediately.
The Compare Output mode (COM1x1:0) bits have two functions. The Waveform Generator
uses the COM1x1:0 bits for defining the Output Compare (OC1x) state at the next compare
match. Secondly the COM1x1:0 bits control the OC1x pin output source.
simplified schematic of the logic affected by the COM1x1:0 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 COM1x1:0 bits are shown. When referring
to the OC1x state, the reference is for the internal OC1x Register, not the OC1x pin. If a sys-
tem reset occur, the OC1x Register is reset to “0”.
Figure 4-41. Compare Match Output Unit, Schematic
The general I/O port function is overridden by the Output Compare (OC1x) from the Waveform
Generator if either of the COM1x1:0 bits are set. However, the OC1x pin direction (input or
output) is still controlled by the Data Direction Register (DDR) for the port pin. The Data Direc-
tion Register bit for the OC1x pin (DDR_OC1x) must be set as output before the OC1x value is
visible on the pin. The port override function is generally independent of the Waveform Gener-
ation mode, but there are some exceptions. See
116
The design of the Output Compare pin logic allows initialization of the OC1x state before the
output is enabled. Note that some COM1x1:0 bit settings are reserved for certain modes of
operation. See
The COM1x1:0 bits have no effect on the Input Capture unit.
and
COMnx1
COMnx0
FOCnx
clk
I/O
Table 4-41 on page 117
Section 4.11.5 “Register Description” on page 51
Waveform
Generator
for details.
D
D
D
PORT
DDR
OCnx
Q
Q
Q
Table 4-39 on page
Atmel ATA5771/73/74
1
0
116,
Figure 4-41
Table 4-40 on page
OCnx
Pin
shows a
105