tmp1941af TOSHIBA Semiconductor CORPORATION, tmp1941af Datasheet - Page 161
tmp1941af
Manufacturer Part Number
tmp1941af
Description
32-bit Tx System Risc
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP1941AF.pdf
(354 pages)
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TA01RUN.TA1RUN
Comparator Timing
Comparator Output
Up-
Counter
Up-Counter Clear
(Match Detect)
(2) Generating a SquareWave with a 50% Duty Cycle
TA1OUT
by toggling the timer flip-flop (TA1FF) periodically. The TA1FF state can be driven out to the
TA1OUT pin. Both the TMRA0 and the TMRA1 can be used as square-wave generators. The
following shows an example using the TMRA1.
Bits 7–2
INTTA1
TA1FF
X = Don’t care,
The 8-bit interval timer mode can be used to generate square-wave output. This is accomplished
Example: Generating square-wave output with a 1.2-µs period on the TA1OUT pin
TA01RUN
TA01MOD
TA1REG
TA1FFCR
P7CR
P7FC
TA01RUN
Bit 1
Bit 0
φT1
Clocking conditions:
Figure 11.9 Square-Wave Generation (50% Duty Cycle)
System clock:
High-speed clock gear: ¤1 (fc)
Prescaler clock:
0
(fc = 40 MHz)
MSB
← −
← 0
← 0
← X
← −
← −
← −
– = No change
7
1
6
X
0
0
X
−
−
X
5
X
X
0
X
−
−
X
TMP1941AF-121
2
4
X
X
0
X
−
−
X
3
−
0
0
1
−
−
−
High-speed (fc)
fperiph/4 (fperiph = fsys)
3
2
−
1
0
0
−
−
1
0
1
0
−
1
1
1
1
1
LSB
0.6 µs @fc = 40 MHz
0
−
−
1
1
−
−
−
1
2
Stops and clears the TMRA1.
Selects 8-bit interval timer mode and
φT1 as the clock source (which provides a 0.2-
µs resolution @fc = 40 MHz).
Sets the time constant value in the TA1REG.
1.2 µs ÷ φT1 ÷ 2 = 3
Clears the TA1FF to 0 and selects the TMRA1
match-detect output as a toggle-trigger signal.
Configures P71 as the TA1OUT output pin.
Starts the TMRA1.
3
0
TMP1941AF
1
2
2003-03-27
3
0
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