h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 367
h8s-2161b
Manufacturer Part Number
h8s-2161b
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2161B.pdf
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12.9.4
If compare-matches A and B occur at the same time, the 8-bit timer operates in accordance with
the priorities for the output states set for compare-match A and compare-match B, as shown in
table 12.5.
Table 12.5 Timer Output Priorities
Output Setting
Toggle output
1 output
0 output
No change
12.9.5
TCNT may increment erroneously when the internal clock is switched over. Table 12.6 shows the
relationship between the timing at which the internal clock is switched (by writing to the CKS1
and CKS0 bits) and the TCNT operation.
When the TCNT clock is generated from an internal clock, the falling edge of the internal clock
pulse is detected. If clock switching causes a change from high to low level, as shown in no. 3 in
table 12.6, a TCNT clock pulse is generated on the assumption that the switchover is a falling
edge, and TCNT is incremented.
Erroneous incrementation can also happen when switching between internal and external clocks.
Conflict between Compare-Matches A and B
Switching of Internal Clocks and TCNT Operation
Priority
High
Low
Rev. 3.00 Mar 21, 2006 page 313 of 788
Section 12 8-Bit Timer (TMR)
REJ09B0300-0300
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