h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 546

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 16 Motor Control PWM Timer (PWM)
16.6
Conflict between Buffer Register Write and Compare Match: If a PWBFR write is performed
in the state immediately after a cycle register compare match, the buffer register and duty register
are both modified. PWM output changed by the cycle register compare match is not changed by
modification of the duty register due to conflict. This may result in unanticipated duty output.
Buffer register modification must be completed before automatic transfer by the DTC, exception
handling due to a compare match interrupt, or the occurrence of a cycle register compare match on
detection of the rise of CMF (compare match flag) in PWCR.
Rev. 2.00 Dec. 05, 2005 Page 508 of 724
REJ09B0200-0200
Address
Write signal
PWCNT
(lower 10 bits)
PWBFR
PWDTR
PWM output
CMF
Usage Note
Figure 16.9 Conflict between Buffer Register Write and Compare Match
T1
Buffer register address
N
Compare match
Tw
Tw
N
T2
0
M
M