NEC PD754144 - Manual (Page 160)

CHAPTER 6 PERIPHERAL HARDWARE FUNCTION
160 User’s Manual U10676EJ3V0UM
6.4.5 Operation in carrier generator mode (CG mode)
In the PWM mode, timer counter channels 1 and 2 operate in combination to implement an 8-bit carrier generator
operation.
When using CG mode, use it in combination with channel 1 and channel 2 of the timer counter.
Timer counter channel 1 generates a remote controller signal.
Timer counter channel 2 generates a carrier clock.
(1) Register setting
In the CG mode, the following eight registers are used.
• Timer counter mode registers TM1 and TM2
• Timer counter control register TC2 Note
• Timer counter count registers T1 and T2
• Timer counter modulo registers TMOD1 and TMOD2
• Timer counter high-level period setting modulo register TMOD2H
Note Timer counter channel 1 uses the timer counter output enable flag (TOE1).
(a) Timer counter mode registers (TM1 and TM2)
In the CG mode, set TM1 and TM2 as shown in Figure 6-44 (for the formats of TM1 and TM2, refer
to Figure 6-27 Format of Timer Counter Mode Register (Channel 1) and Figure 6-28 Format of
Timer Counter Mode Register (Channel 2)).
TM1 and TM2 are manipulated by an 8-bit manipulation instruction. Bit 3 of TM1 and TM2 is timer start
command bit which can be manipulated in 1-bit units and is automatically cleared to 0 when the timer
starts operating.
TM1 and TM2 are also cleared to 00H when the internal reset signal is asserted.