HD6432646 Hitachi, HD6432646 Datasheet - Page 663
HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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H'000. The CMF bit in PWCR2 is set, and if the IE bit in PWCR2 has been set, an interrupt can be
requested or the DTC can be activated.
Stopping: When the CST bit in PWCR2 is cleared to 0, PWCNT2 is reset and stops. PWDTR2A
to PWDTR2H are reset. All PWM outputs go low (or high if the corresponding bit in PWPR2 is
set to 1).
17.5
Contention 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 overwritten. PWM output changed by the cycle register
compare match is not changed in the overwrite of the duty register due to contention. This may
result in unanticipated duty output. In the case of channel 2, the duty register used as the transfer
destination is selected by the TDS bit of the buffer register when an overwrite of the duty register
occurs due to contention. This can also result in an unintended overwrite of the duty register.
Buffer register rewriting must be completed before automatic transfer by the DTC (data transfer
controller), 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.
Address
Write signal
PWCNT
(lower 10 bits)
PWBFR
PWDTR
PWM output
CMF
ø
Usage Note
Figure 17-12 PWM Channel 1 Operation
T1
Buffer register address
N
Compare match
Tw
Tw
N
T2
0
M
M
629
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