HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 304
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HD6432160
Manufacturer Part Number
HD6432160
Description
Hitachi 16-Bit Single-Chip Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6432160.pdf
(829 pages)
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11.7.4
When the internal clock is changed, the changeover may cause FRC to increment. This depends on
the time at which the clock is switched (bits CKS1 and CKS0 are rewritten), as shown in table
11.3.
When an internal clock is used, the FRC clock is generated on detection of the falling edge of the
internal clock scaled from the system clock (ø). If the clock is changed when the old source is high
and the new source is low, as in case no. 3 in table 11.3, the changeover is regarded as a falling
edge that triggers the FRC clock, and FRC is incremented. Switching between an internal clock
and external clock can also cause FRC to increment.
Rev. 2.0, 08/02, page 264 of 788
Figure 11.20 Conflict between OCRAR/OCRAF Write and Compare-Match
Switching of Internal Clock and FRC Operation
Compare-match signal
Internal write signal
OCRAR (OCRAF)
(When Automatic Addition Function is Used)
Address
OCRA
FRC
ø
Write cycle of OCRAR/OCRAF
Automatic addition is not performed
because compare-match signals are disabled.
OCRAR (OCRAF)
T 1
address
Disabled
Old data
T 2
N
N
New data
N+1
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