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(b) 8-bit timer H mode register 1 (TMHMD1)
After reset: 00H
TMHMD1
Note Set so as to satisfy the following conditions.
= 4.0 to 5.5 V: Count clock ≤ 10 MHz
V
DD
= 2.7 to 4.0 V: Count clock ≤ 5 MHz
V
DD
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.
318
CHAPTER 9 8-BIT TIMER H
R/W
Address: FFFFF590H
<7>
6
5
TMHE1
CKSH12 CKSH11 CKSH10 TMMD11 TMMD10 TOLEV1
TMHE1
0
Stop timer count operation (8-bit timer counter H1 = 00H)
1
Enable timer count operation (Counting starts when clock is input)
CKSH12
CKSH11
CKSH10
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
Other than above
TMMD11
TMMD10
0
0
Interval timer mode
0
1
Carrier generator mode
1
0
PWM output mode
1
1
Setting prohibited
TOLEV1
Timer output level control (default)
0
Low level
1
High level
TOEN1
0
Disable output
1
Enable output
User's Manual U16896EJ2V0UD
4
3
2
8-bit timer H1 operation enable
Selection of count clock
Note
f
= 16.0 MHz
f
= 20.0 MHz
Count clock
XX
XX
f
Setting prohibited
Setting prohibited
XX
100 ns
125 ns
f
/2
XX
f
/4
200 ns
250 ns
XX
μ
800 ns
1
f
/16
XX
μ
μ
f
/64
3.2
s
4
XX
f
/2048
R
Setting prohibited
8-bit timer H1 operation mode
Timer output control
<1>
<0>
TOEN1
f
= 10.0 MHz
XX
100 ns
200 ns
400 ns
μ
s
1.6
s
μ
s
6.4
s
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