CHAPTER 9 8-BIT TIMER H
User’s Manual U16896EJ2V0UD
318
(b) 8-bit timer H mode register 1 (TMHMD1)
TMHE1
Stop timer count operation (8-bit timer counter H1 = 00H)
Enable timer count operation (Counting starts when clock is input)
TMHE1
0
1
8-bit timer H1 operation enable
TMHMD1
CKSH12
CKSH11 CKSH10 TMMD11 TMMD10 TOLEV1
TOEN1
After reset: 00H R/W Address: FFFFF590H
f
XX
f
XX
/2
f
XX
/4
f
XX
/16
f
XX
/64
CKSH12
0
0
0
0
1
1
CKSH11
0
0
1
1
0
0
CKSH10
0
1
0
1
0
1
Setting prohibited
125 ns
250 ns
1 s
4 s
Selection of count clock
Count clock
Note
Interval timer mode
Carrier generator mode
PWM output mode
Setting prohibited
TMMD11
0
0
1
1
TMMD10
0
1
0
1
8-bit timer H1 operation mode
f
R
/2048
Setting prohibited
Other than above
Low level
High level
TOLEV1
0
1
Timer output level control (default)
Disable output
Enable output
TOEN1
0
1
Timer output control
f
XX
= 16.0 MHz
<7>
6
5
4
3
2
<1>
<0>
μ
μ
Setting prohibited
100 ns
200 ns
800 ns
3.2 s
f
XX
= 20.0 MHz
f
XX
= 10.0 MHz
100 ns
200 ns
400 ns
1.6 s
6.4 s
μ
μ
μ
Note
Set so as to satisfy the following conditions.
V
DD
= 4.0 to 5.5 V: Count clock
≤
10 MHz
V
DD
= 2.7 to 4.0 V: Count clock
≤
5 MHz
Cautions 1. When the TMHE1 bit = 1, setting bits other than those of the TMHMD1 register is
prohibited.
2. In the PWM output mode and carrier generator mode, be sure to set the CMP11
register when starting the timer count operation (TMHE1 bit = 1) after the timer
count operation was stopped (TMHE1 bit = 0) (be sure to set again even if setting
the same value to the CMP11 register).
3. When using the carrier generator mode, set 8-bit timer H1 count clock frequency
to six times 8-bit timer/event counter 51 count clock frequency or higher.
