
CHAPTER 8 8-BIT TIMERS H0 AND H1
User’s Manual U16228EJ2V0UD
212
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
f
X
f
X
/2
2
f
X
/2
4
f
X
/2
6
f
X
/2
12
f
R
/2
7
Setting prohibited
CKS12
0
0
0
0
1
1
CKS11
0
0
1
1
0
0
CKS10
0
1
0
1
0
1
(10 MHz)
(2.5 MHz)
(625 kHz)
(156.25 kHz)
(2.44 kHz)
(1.88 kHz (TYP.))
Count clock (f
CNT
) selection
Other than above
Interval timer mode
Carrier generator mode
PWM output mode
Setting prohibited
TMMD11
0
0
1
TMMD10
0
1
0
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
Other than above
<7>
6
5
4
3
2
<1>
<0>
Cautions 1. When the Ring-OSC clock is selected as the clock to be supplied to the CPU, the clock of the
Ring-OSC oscillator is divided and supplied as the count clock. If the count clock is the
Ring-OSC clock, the operation of 8-bit timer H1 is not guaranteed (except when CKS12,
CKS11, CKS10 = 1, 0, 1 (f
R
/2
2. When TMHE1 = 1, setting the other bits of the TMHMD1 register is prohibited.
3. In the PWM output mode and carrier generator mode, be sure to set 8-bit timer H compare
register 11 (CMP11) when starting the timer count operation (TMHE1 = 1) after the timer count
operation was stopped (TMHE1 = 0) (be sure to set again even if setting the same value to the
CMP11 register).
4. When the carrier generator mode is used, set so that the count clock frequency of TMH1
becomes more than 6 times the count clock frequency of TM51.
7
)).