NEC 78K0 User Manual page 196

To control the carrier pulse output during a count operation, the NRZ1 and NRZB1 bits of the TMCYC1 register
have a master and slave bit configuration. The NRZ1 bit is read-only but the NRZB1 bit can be read and written.
The INTTM51 signal is synchronized with the 8-bit timer H1 count clock and output as the INTTM5H1 signal. The
INTTM5H1 signal becomes the data transfer signal of the NRZ1 bit, and the NRZB1 bit value is transferred to the
NRZ1 bit. The timing for transfer from the NRZB1 bit to the NRZ1 bit is as shown below.
8-bit timer H1
count clock
INTTM51
INTTM5H1
<1> The INTTM51 signal is synchronized with the count clock of 8-bit timer H1 and is output as the INTTM5H1
signal.
<2> The value of the NRZB1 bit is transferred to the NRZ1 bit at the second clock from the rising edge of the
INTTM5H1 signal.
Cautions 1. Do not rewrite the NRZB1 bit again until at least the second clock after it has been rewritten,
or else the transfer from the NRZB1 bit to the NRZ1 bit is not guaranteed.
2. When 8-bit timer/event counter 51 is used in the carrier generator mode, an interrupt is
generated at the timing of <1>. When 8-bit timer/event counter 51 is used in a mode other
than the carrier generator mode, the timing of the interrupt generation differs.
196
CHAPTER 8 8-BIT TIMERS H0 AND H1
Figure 8-13. Transfer Timing
TMHE1
<1>
0
NRZ1
<2>
1
NRZB1
RMC1
User's Manual U16227EJ2V0UD
1 0
0 1