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3819 Datasheet(PDF) 98 Page - Renesas Technology Corp

Part # 3819
Description  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  218 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

3819 Datasheet(HTML) 98 Page - Renesas Technology Corp

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84
2. APPLICATION
MITSUBISHI MICROCOMPUTER
3819 Group
2.2 Timer
3819 Group USER’S MANUAL
Fig. 2.2.20 Setting of related registers [Measurement of frequency]
63
T1
Timer 1 (Address:2016)
Set "division ratio – 1"
255
T4
Timer 4 (Address:2316)
Set “255” to this register immediately before
count- ing pulse.
(After a certain time, this value is decreased by
the number of input pulses)
1
Timer 1 interrupt : Enabled
ICON1
Interrupt control register 1 (Address:3E16)
0
0
Timer 4 interrupt : Disabled
ICON2
Interrupt control register 2 (Address:3F16)
0
Judgment of Timer 4 interrupt request bit
(When this bit is set to “1” at reading out the
count value of the timer 4 (address:2316), 256
pulses or more are input (at setting 255 to the
Timer 4).)
IREQ2
Interrupt request register 2 (Address:3D16)
01
0
Timer 1 count source : f(XIN)/16
Timer 1 output selection : I/O port
(Not to be used timer 1 output)
Timer 1 count : Stopped
Set to “0” at starting to count.
T12M
Timer 12 mode register (Address:2816)
Timer 4 count source : External count input from CNTR1 pin.
Timer 4 count : Operating
T34M
Timer 34 mode register (Address:2916)
0
10



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