Rev. 2.0, 11/00, page 292 of 1037
Bit 3: Selection of the Clock Source and Prescaler (TMA3)
This bit works to select the PSS or PSW as the clock source for the Timer A.
Bit 3
TMA3
Description
0
Selects the PSS as the clock source for the Timer A
(Initial value)
1
Selects the PSW as the clock source for the Timer A
Bits 2 to 0: Clock Selection (TMA2 to TMA0)
These bits work to select the clock to input to the TCA. In combination with the TMA3 bit, the
choices are as follows:
Bit 3
Bit 2
Bit 1
Bit 0
TMA3
TMA2
TMA1
TMA0
Prescaler division ratio (interval timer)
or overflow cycle (time base)
Operation
mode
0
PSS,
φ
/16384 (Initial value)
0
1
PSS,
φ
/8192
0
PSS,
φ
/4096
0
1
1
PSS,
φ
/1024
0
PSS,
φ
/512
0
1
PSS,
φ
/256
0
PSS,
φ
/64
0
1
1
1
PSS,
φ
/16
Interval
timer mode
0
1s
0
1
0.5s
0
0.25s
0
1
1
0.03125s
0
0
1
0
1
1
1
1
Works to clear the PSW and TCA to H'00
Clock time
base mode
Note:
φ
= f osc
Содержание Hitachi H8S/2191
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