HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 278

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

Reset-Synchronized PWM Mode Operation: Figure 10.32 shows an example of operation in the
reset-synchronized PWM mode. TCNT3 operates as an upcounter that is cleared to H'0000 at
compare match with GRA3. TCNT4 runs independently and is isolated from GRA4 and GRB4.
The PWM waveform outputs toggle at each compare match (GRB3, GRA3, and GRB4 with
TCNT3) and when the counter is cleared.
See section 10.4.8, Buffer Mode, for details on simultaneously setting reset-synchronized PWM
mode and buffer operation.
10.4.6
In the complementary PWM mode, three pairs of complementary, non-overlapping, positive and
negative PWM waveforms can be obtained using channels 3 and 4. In complementary PWM
mode, the TIOCA3, TIOCB3, TIOCA4, TOCXA4, TIOCB4, and TOCXB4 pins automatically
become PWM output pins and TCNT3 and TCNT4 become upcounters. Table 10.14 shows the
PWM output pins used and table 10.15 shows the settings of the registers used.
264 HITACHI
TOCXA4
TOCXB4
TIOCA3
TIOCB3
TIOCA4
TIOCB4
GRA3
GRB3
GRA4
GRB4
Complementary PWM Mode
TCNT value
Figure 10.32 Reset-Synchronized PWM Mode Operation Example 1
Counter cleared at GRA3 compare match
Time