
160
42073A-MCU Wireless-02/13
ATmega2564/1284/644RFR2
The Register describes the source timestamp register used for the relative compare
mode. The time stamp source can be selected separately for each compare unit.
Possible sources for the relative compare are the Transmit Timestamp, the Receive
Timestamp or the Beacon Timestamp (default).
Bit 7:6 – Res1:0 - Reserved Bit
This bit is reserved for future use. The result of a read access is undefined. The register
bit must always be written with the reset value.
Bit 5:4 – SCCS31:30 - Symbol Counter Compare Source select register for
Compare Unit 3
This configuration bits allow the selection of the source timestamp used for the relative
compare mode. The default selection is the Beacon Timestamp Register, but the
Transmit Frame Timestamp or the Receive Frame Timestamp register can also be
selected.
Table 10-80 SCCS3 Register Bits
Register Bits
Value
Description
SCCS31:30
0
Compare Unit 3 Relative Compare Source =
Beacon Timestamp Register
1
Compare Unit 3 Relative Compare Source =
Transmit Frame Timestamp Register
2
Compare Unit 3 Relative Compare Source =
Received Frame Timestamp Register
Bit 3:2 – SCCS21:20 - Symbol Counter Compare Source select register for
Compare Unit 2
This configuration bits allow the selection of the source timestamp used for the relative
compare mode. The default selection is the Beacon Timestamp Register, but the
Transmit Frame Timestamp or the Receive Frame Timestamp register can also be
selected.
Table 10-81 SCCS2 Register Bits
Register Bits
Value
Description
SCCS21:20
0
Compare Unit 2 Relative Compare Source =
Beacon Timestamp Register
1
Compare Unit 2 Relative Compare Source =
Transmit Frame Timestamp Register
2
Compare Unit 2 Relative Compare Source =
Received Frame Timestamp Register
Bit 1:0 – SCCS11:10 - Symbol Counter Compare Source select register for
Compare Unit 1
This configuration bits allow the selection of the source timestamp used for the relative
compare mode. The default selection is the Beacon Timestamp Register, but the
Transmit Frame Timestamp or the Receive Frame Timestamp register can also be
selected.
Table 10-82 SCCS1 Register Bits
Register Bits
Value
Description
SCCS11:10
0
Compare Unit 1 Relative Compare Source =
Beacon Timestamp Register
1
Compare Unit 1 Relative Compare Source =
Transmit Frame Timestamp Register