Owners manual

Interfaces
H3 Datasheet(Revision1.2) Copyright© 2015 Allwinner Technology Co.,Ltd.All Rights Reserved. Page 485
can be calculated by ((ATHR + 1)*(ATHC? Sample Clock: 128*Sample Clock)).
15:8
R/W
0x18
ITHR
Idle Threshold for CIR
The Receiver uses it to decide whether the CIR command has been received.
If there is no CIR signal on the air, the receiver is staying in IDLE status. One
active pulse will bring the receiver from IDLE status to Receiving status. After
the CIR is end, the inputting signal will keep the specified level (high or low
level) for a long time. The receiver can use this idle signal duration to decide
that it has received the CIR command. The corresponding flag is asserted. If
the corresponding interrupt is enable, the interrupt line is asserted to CPU.
When the duration of signal keeps one status (high or low level) for the
specified duration ( (ITHR + 1)*128 sample_clk ), this means that the
previous CIR command has been finished.
7:2
R/W
0xa
NTHR
Noise Threshold for CIR
When the duration of signal pulse (high or low level) is less than NTHR, the
pulse is taken as noise and should be discarded by hardware.
0: all samples are recorded into RX FIFO
1: If the signal is only one sample duration, it is taken as noise and
discarded.
2: If the signal is less than (<=) two sample duration, it is taken as noise and
discarded.
…
61: if the signal is less than (<=) sixty-one sample duration, it is taken as
noise and discarded.
1:0
R/W
0
SCS
Sample Clock Select for CIR
SCS2
SCS[1]
SCS[0]
Sample Clock
0
0
0
ir_clk/64
0
0
1
ir_clk/128
0
1
0
ir_clk/256
0
1
1
ir_clk/512
1
0
0
ir_clk
1
0
1
Reserved
1
1
0
Reserved
1
1
1
Reserved
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