BAT32G1x9 user manual | Chapter 10 Timer M
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Rev.1.02
(2) Digital filters
Sample the TMIOji inputs (i=0, 1, j=A, B, C, D) if the signal 3 times the same, the level is considered to
have been determined. The function and sample clock of the digital filter must be selected through the TMDFi
registers.
The block diagram of the digital filter is shown in Figure 10-48.
Figure 10-48
Block diagram of a digital filter
operational clock of
timer M
f
CLK
C
D
Q
Latches
C
D
Q
Latches
TMIOji input signal
C
D
Q
Latches
C
D
Q
Latches
identical signal
detection circuit
(trigger output)
edge
detection
circuit
DFj
1
IOA2~IOA0
IOB2~IOB0
IOC3~IOC0
IOD3~IOD0
edge
detection
circuit
0
=101B
=100B
=011B
=010B
=001B
=000B
TMCLK
f
CLK
/32
f
CLK
/8
f
CLK
/4
f
CLK
/2
f
CLK
,
f
HOCO
Note 1
f
CLK
/32
Note 2
f
CLK
/8
f
CLK
=00B
=01B
=10B
=11B
TCK2~TCK0
DFCK1,DFCK0
sample clock
Note 2
Note 2
clock period selected via TCLK2~TCLK0 or
DFCLK1~DFCLK0.
as long as 1 out of 3 times the signal
is not identical, the signnal will be
discarded as noise and not been
transmitted.
the max signal
transmit delay is 5
sample clock cycles
all 3 signals are
same, It is treated
as signal change.
Note i=0, 1 j=A, B, C, D
TCK0~TCK2: TMCri register Bits
DFCK0,DFCK1,DFj:TMDF register Bits
IOA0~IOA2,IOB0~IOB2:TMIORAi register Bits
IOC0~IOC3,IOD0~IOD3:TMIORCi register Bits