
170
42073A-MCU Wireless-02/13
ATmega2564/1284/644RFR2
source, regardless of the selected clock. After wakeup, it switches back to the previosly
selected clock source.
Bit 3 – SCTSE - Symbol Counter Automatic Timestamping enable
This bit enables automatic SFD and Beacon Timestamping. If the bit is zero, no
automatic timestamp capturing is possible. Only manual beacon timestamping can be
used.
Bit 2 – SCCMP3 - Symbol Counter Compare Unit 3 Mode select
This bit enables the relative compare mode for compare unit 3. If enabled, the counter
value is compared against the content of the timestamp register selected in Compare
Source Register SCCSR select bits SCCS3 plus the content of the compare register 3
(SCCNT == timestamp+SCOCR3). Otherwise, the counter is compared against the
compare register 3 (SCCNT == SCOCR3).
Bit 1 – SCCMP2 - Symbol Counter Compare Unit 2 Mode select
This bit enables the relative compare mode for compare unit 2. If enabled, the counter
value is compared against the content of the timestamp register selected in Compare
Source Register SCCSR select bits SCCS2 plus the content of the compare register 2
(SCCNT == timestamp+SCOCR2). Otherwise, the counter is compared against the
compare register 2 (SCCNT == SCOCR2).
Bit 0 – SCCMP1 - Symbol Counter Compare Unit 1 Mode select
This bit enables the relative compare mode for compare unit 1. If enabled, the counter
value is compared against the content of the timestamp register selected in Compare
Source Register SCCSR select bits SCCS1 plus the content of the compare register 1
(SCCNT == timestamp+SCOCR1). Otherwise, the counter is compared against the
compare register 1 (SCCNT == SCOCR1).
10.11.35 SCCR1 – Symbol Counter Control Register 1
Bit
7
6
5
4
NA ($DD)
Res6
Res5
SCBTSM
SCCKDIV2
SCCR1
Read/Write
R
RW
Initial Value
0
Bit
3
2
1
0
NA ($DD)
SCCKDIV1
SCCKDIV0
SCEECLK
SCENBO
SCCR1
Read/Write
RW
Initial Value
0
This register is used to enable the backoff slot counter.
Bit 7:6 – Res6:5 - 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 – SCBTSM - Symbol Counter Beacon Timestamp Mask Register
This bit must be set to disable automatic beacon timestamping. All other timestamps as
well as manual beacon timestamping is not effected by this setting.
Bit 4:2 – SCCKDIV2:0 - Clock divider for synchronous clock source (16MHz
Transceiver Clock)