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TMP93CS41 датащи(PDF) 108 Page - Toshiba Semiconductor

номер детали TMP93CS41
подробное описание детали  CMOS 16-Bit Microcontroller
PDF  248 Pages
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производитель  TOSHIBA [Toshiba Semiconductor]
домашняя страница  http://www.semicon.toshiba.co.jp/eng
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TMP93CS41 датащи(HTML) 108 Page - Toshiba Semiconductor

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TMP93CS40/TMP93CS41
20004-02-10
93CS40-106
2. Generating a 50% duty, square-wave pulse
The timer flip-flop (TFF1) is inverted at constant intervals, and its status is output to
timer output pin (TO1).
Example:To output a 2.4
µs square wave pulse from the TO1 pin at fc = 20 MHz, set each
register by the following procedures. Either timer 0 or timer 1 may be used, but
this example uses timer 1.
* Clock condition
System clock:
High frequency (fc)
Clock gear:
1 (fc)
Prescaler clock: fFPH
7
6
5
4
3
2
1
0
TRUN
← − X − − − − 0 −
Stop timer 1, and clear it to “0”.
TMOD
← 0 0 X X 0 1 − −
Set the 8-bit timer mode, and select
φT1 (0.4 µs at fc =
20 MHz) as the input clock cycle time.
TREG1
← 0 0 0 0 0 0 1 1
Set the timer register at 2.4
µs ÷ φT1 ÷ 2 = 3.
TFFCR
← − − − − 1 0 1 1
Clear TFF1 to “0”, and set to invert by the match detect
signal from timer 1.
P7CR
← X X X X − − 1 −
P7FC
← X X X X − − 1X
Select P71 as TO1 pin.
TRUN
← 1 X − − − − 1 −
Start timer 1 counting.
X: Don’t care, −: No change
Figure 3.7.7 Square Wave (50% duty) Output Timing Chart
φ T1
TRUN
<T1RUN>
Bits 7 to 2
Bit1
Bit0
Comparator
timing
Comparator output
(Matching detect)
INTT1
Up
counter clear
TFF1
TO1
1.2
µs at fc = 20 MHz
Up
counter
0
1
2
3
0
1
2
3
0
1
2
3
0



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