SH7021 datasheet(310/509 Pages) RENESAS

310 / 509 page

294 RENESAS

10.6.11

Note on Writing in the Synchronizing Mode

After the synchronizing mode is selected, if the TCNT is written by byte access, all 16 bits of all

synchronized counters assume the same value as the counter that was addressed.

Example: Figures 10.67 and 10.68 show byte write and word write when channels 2 and 3 are

synchronized

TCNT2

TCNT3

TCNT2

TCNT3

Write A to lower

byte of channel 3

Write A to upper

byte of channel 2

TCNT2

TCNT3

Upper

byte

Lower

byte

Upper

byte

Lower

byte

Upper

byte

Lower

byte

Figure 10.67

Byte Write to Channel 2 or Byte Write to Channel 3

TCNT2

TCNT3

Word write of AB

for channel 2 or 3

TCNT2

TCNT3

Upper

byte

Lower

byte

Upper

byte

Lower

byte

Figure 10.68

Word Write to Channel 2 or Word Write to Channel 3

10.6.12

Note on Setting Reset-synchronized PWM Mode/Complementary PWM Mode

When the CMD1 and CMD0 bits of TFCR are set, note the following.

1. Writes to CMD1 and CMD0 should be done while TCNT3 and TCNT4 are halted.

2. Changes of setting from the reset-synchronized PWM mode to the complementary PWM mode

and vice versa are inhibited. Set the reset-synchronized PWM mode or complementary PWM

mode after first setting normal operation (clear CMD1 bit to 0).

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