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FUNCTIONAL DESCRIPTION
2.6 Timers
Timer 12 Mode Register
b7 b6 b5 b4 b3 b2 b1 b0
0
Fig. 2.6.3 Timer 12 mode register (address 00F4
(3) Timer 3
Timer 3 can select one of the following count sources:
f(X
)/16
IN
External clock from pin H
External clock from pin P2
The count source of timer 3 is selected by setting bits 5 and 0 of the timer 34 mode register (address
00F5
)
16
Timer 3 interrupt request occurs at timer 3 overflow.
(4) Timer 4
Timer 4 can select one of the following count sources:
f(X
)/16
IN
f(X
)/2
IN
Timer 3 overflow signal
The count source of timer 3 is selected by setting bits 4 and 1 of the timer 34 mode register (address
00F5
). When timer 3 overflow signal is a count source for timer 4, timer 3 functions as an 8-bit
16
prescaler.
Timer 4 interrupt request occurs at timer 4 overflow.
2-36
Timer 12 mode register (T12M) [Address 00F4
B
Name
0
Timer 1 count source
selection bit (T12M0)
1
Timer 2 count source
selection bit
(T12M1)
Timer 1 count
2
stop bit (T12M2)
Timer 2 count stop
3
bit (T12M3)
4
Timer 2 internal count
source selection bit
(T12M4)
5
Fix this bit to "0."
6,7
Nothing is assigned. These bits are write disable
bits. When these bits are read out, the values are
"0."
)
16
SYNC
/TIM3
3
7220 Group User's Manual
]
16
Functions
0: f(X
)/16
IN
1: f(X
)/4096
IN
0: Internal clock
1: External clock from
P2
/TIM2 pin
4
0: Count start
1: Count stop
0: Count start
1: Count stop
0: f(X
)/16
IN
1: Timer 1 overflow
After reset
R
W
0
R
W
0
R
W
0
R
W
0
R
W
0
R
W
0
R
W
0
R
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