m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 98

• Manufacturer Part Number: m3819
• Description: Mitsubishi 8-bit Single-chip Microcomputer 740 Family / 38000 Series
• Manufacturer: Renesas Electronics Corporation.

2. APPLICATION
Fig. 2.2.20 Setting of related registers [Measurement of frequency]
84
T12M
T4
T34M
T1
ICON1
ICON2
IREQ2
Timer 12 mode register (Address:28
Timer 4 (Address:23
Interrupt control register 1 (Address:3E
Interrupt request register 2 (Address:3D
Timer 34 mode register (Address:29
Timer 1 (Address:20
Interrupt control register 2 (Address:3F
0
0
1
1 0
255
63
0
16
16
0
0
0
)
)
1
3819 Group USER’S MANUAL
Timer 1 output selection : I/O port
(Not to be used timer 1 output)
Timer 4 count : Operating
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:23
pulses or more are input (at setting 255 to the
Timer 4).)
Timer 1 count : Stopped
Set to “0” at starting to count.
Timer 1 count source : f(X
Timer 4 count source : External count input from CNTR
Timer 1 interrupt : Enabled
Timer 4 interrupt : Disabled
Set "division ratio – 1"
Set “255” to this register immediately before
count- ing pulse.
(After a certain time, this value is decreased by
the number of input pulses)
16
16
)
)
16
16
16
)
)
)
IN
)/16
MITSUBISHI MICROCOMPUTER
16
), 256
3819 Group
2.2 Timer
1
pin.