CHAPTER 8 8-BIT TIMERS H0 AND H1
User’s Manual U16899EJ2V0UD
206
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
7
)).
2. When TMHE1 = 1, setting the other bits of TMHMD1 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
CMP11).
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.
Remarks 1. f
X
: High-speed system clock oscillation frequency
2. f
R
: Ring-OSC clock oscillation frequency
3. Figures in parentheses apply to operation at f
X
= 10 MHz, f
R
= 240 kHz (TYP.).
(2) 8-bit timer H carrier control register 1 (TMCYC1)
This register controls the remote control output and carrier pulse output status of 8-bit timer H1.
This register can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input clears this register to 00H.
Figure 8-7. Format of 8-Bit Timer H Carrier Control Register 1 (TMCYC1)
0
TMCYC1
0
0
0
0
RMC1
NRZB1
NRZ1
Address: FF6DH After reset: 00H R/W
Note
Low-level output
High-level output
Low-level output
Carrier pulse output
RMC1
0
0
1
1
NRZB1
0
1
0
1
Remote control output
Carrier output disabled status (low-level status)
Carrier output enabled status
(RMC1 = 1: Carrier pulse output, RMC1 = 0: High-level status)
NRZ1
0
1
Carrier pulse output status flag
<0>
Note Bit 0 is read-only.