Bits 3 to 0: Internal clock select (TMA3 to TMA0)
Bits 3 to 0 select the clock input to TCA. The selection is made as follows.
Description
Bit 3
Bit 2
Bit 1
Bit 0
Prescaler and Divider Ratio
TMA3
TMA2
TMA1
TMA0
or Overflow Period
Function
0
0
0
0
PSS, ø/8192
(initial value)
Interval timer
1
PSS, ø/4096
1
0
PSS, ø/2048
1
PSS, ø/512
1
0
0
PSS, ø/256
1
PSS, ø/128
1
0
PSS, ø/32
1
PSS, ø/8
1
0
0
0
PSW, 1 s
Clock time
1
PSW, 0.5 s
base
1
0
PSW, 0.25 s
(when using
1
PSW, 0.03125 s
32.768 kHz)
1
0
0
PSW and TCA are reset
1
1
0
1
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