HD64F3670 RENESAS [Renesas Technology Corp], HD64F3670 Datasheet - Page 165

• Manufacturer Part Number: HD64F3670
• Description: Hitachi Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Figure 11.11 shows an example of buffer operation when the FTIOB pin is set to PWM mode and
GRD is set as the buffer register for GRB. TCNT is cleared by compare match A, and FTIOB
outputs 1 at compare match B and 0 at compare match A.
Due to the buffer operation, the FTIOB output level changes and the value of buffer register GRD
is transferred to GRB whenever compare match B occurs. This procedure is repeated every time
compare match B occurs.
Figures 11.12 and 11.13 show examples of the output of PWM waveforms with duty cycles of 0%
and 100%.
GRA
GRB
H'0000
GRD
GRB
FTIOB
GRA
GRB
GRC
GRD
H'0000
FTIOB
FTIOC
FTIOD
TCNT value
H'0200
Figure 11.11 Buffer Operation Example (Output Compare)
TCNT value
H'0200
Figure 11.10 PWM Mode Example (2)
H'0200
H'0450
Counter cleared by compare match A
H'0450
H'0450
H'0520
Rev. 2.0, 03/02, page 141 of 298
H'0520
Time
H'0520
Time