HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 289

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

Complementary PWM Mode: When the count direction of TCNT3 and TCNT4 change, the BR
value is transferred to the GR. The following timing is employed for this transfer:
• Whenever TCNT3 and GRA3 compare-match
• Whenever TCNT4 underflows
Reset-Synchronized PWM Mode: The BR value is transferred to GR upon a GRA3 compare
match.
Procedure for Selecting the Buffer Mode (figure 10.47):
1. Set the TIOR to select the output compare or input capture function of the GR.
2. Set bits BFA3, BFB3 and BFB4 in the TFCR to select the buffer mode for the GR.
3. Set the STR bit in the TSTR to 1 to start the TCNT counting.
Input capture signal
BR
Figure 10.47 Procedure for Selecting the Buffer Mode
Figure 10.46 Input Capture Buffer Operation
Select general register function
Select buffer mode
Start counting
Buffer mode
Buffer mode
GR
(1)
(2)
(3)
TCNT
HITACHI 275