HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 282

• Manufacturer Part Number: HD6413008F
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
• Manufacturer: RENESAS [Renesas Technology Corp]

8. 16-Bit Timer
Note on Waveform Period Setting: When a counter is cleared by compare match, the counter is
cleared in the last state at which the 16TCNT value matches the general register value, at the time
when this value would normally be updated to the next count. The actual counter frequency is
therefore given by the following formula:
Note on Writes in Synchronized Operation: When channels are synchronized, if a 16TCNT
value is modified by byte write access, all 16 bits of all synchronized counters assume the same
value as the counter that was addressed.
(Example) When channels 1 and 2 are synchronized
Rev.4.00 Aug. 20, 2007 Page 238 of 638
REJ09B0395-0400
• Byte write to channel 1 or byte write to channel 2
• Word write to channel 1 or word write to channel 2
16TCNT1
16TCNT2
16TCNT1
16TCNT2
f =
(f: counter frequency. φ: system clock frequency. N: value set in general register.)
(N + 1)
φ
Upper byte Lower byte
Upper byte Lower byte
W
W
Y
Y
X
Z
X
Z
Write A to upper byte
of channel 1
Write A to lower byte
of channel 2
Write AB word to
channel 1 or 2
16TCNT1
16TCNT2
16TCNT1
16TCNT2
16TCNT1
16TCNT2
Upper byte Lower byte
Upper byte Lower byte
Upper byte Lower byte
A
A
Y
Y
A
A
X
X
A
A
B
B