NEC PD754144 - Manual (Page 166)

CHAPTER 6 PERIPHERAL HARDWARE FUNCTION
166 User’s Manual U10676EJ3V0UM
Figure 6-48. Carrier Generator Operation Timing
<1> Timer (channel 2) operation and carrier clock
(Modulo register H (TMOD2H) = i, Modulo register (TMOD2) = k)
Count pulse
(CP)
Timer counter
count register
(T2)
Carrier clock
0 k 1 2 i–1 i 0 1 2 k–1 k 0 1 2 3
<2> Carrier clock, timer (channel 1), NRZB, NRZ, and PTO2 pin
(Modulo register (TMOD1) = n, Timer (channel 1) count pulse = Carrier clock)
No return zero
buffer flag
(NRZB)
Timer counter
count register
(T1)
Carrier clock
No return
zero flag
(NRZ)
PTO2 pin
0 n 1 2 n–1 n 0 1 2 n–1 n 0 1 2 3
1 0 1 0
1 0 1 0