
CHAPTER 8 8-BIT TIMERS H0 AND H1
User’s Manual U19780EJ2V0UD
266
Figure 8-6. Format of 8-Bit Timer H Mode Register 1 (TMHMD1)
TMHE1
Stops timer count operation (counter is cleared to 0)
Enables timer count operation (count operation started by inputting clock)
TMHE1
0
1
Timer operation enable
TMHMD1
CKS12
CKS11
CKS10
TMMD11 TMMD10 TOLEV1
TOEN1
Address: FF6CH After reset: 00H R/W
Interval timer mode
Carrier generator mode
PWM output mode
Setting prohibited
TMMD11
0
0
1
1
TMMD10
0
1
0
1
Timer operation mode
Low level
High level
TOLEV1
0
1
Timer output level control (in default mode)
Disables output
Enables output
TOEN1
0
1
Timer output control
<7>
6
5
4
3
2
<1>
<0>
CKS12
0
0
0
0
1
1
1
1
CKS11
0
0
1
1
0
0
1
1
CKS10
0
1
0
1
0
1
0
1
Count clock selection
Note 1
f
PRS
Note 2
f
PRS
/2
2
f
PRS
/2
4
f
PRS
/2
6
f
PRS
/2
12
f
RL
/2
7
f
RL
/2
9
f
RL
f
PRS
=
2 MHz
2 MHz
500 kHz
125 kHz
31.25 kHz
0.49 kHz
1.88 kHz (TYP.)
0.47 kHz (TYP.)
240 kHz (TYP.)
f
PRS
=
5 MHz
5 MHz
1.25 MHz
312.5 kHz
78.13 kHz
1.22 kHz
f
PRS
=
10 MHz
10 MHz
2.5 MHz
625 kHz
156.25 kHz
2.44 kHz
f
PRS
=
20 MHz
20 MHz
Note 3
5 MHz
1.25 MHz
312.5 kHz
4.88 kHz
Note 1.
The frequency that can be used for the peripheral hardware clock (f
PRS
) differs depending on the power
supply voltage.
Supply Voltage
Use frequency range of peripheral hardware clock (f
PRS
)
2.7 V
≤
V
DD
≤
5.5 V
f
PRS
≤
20 MHz
1.8 V
≤
V
DD
< 2.7 V
f
PRS
≤
5 MHz
(The values shown in the table above are those when f
PRS
= f
XH
(XSEL = 1).)