h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 394
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h8s-2158
Manufacturer Part Number
h8s-2158
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2158.pdf
(927 pages)
- Current page: 394 of 927
- Download datasheet (7Mb)
Section 13 8-Bit Timer (TMR)
13.9.4
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 13.5.
Table 13.5 Timer Output Priorities
13.9.5
TCNT may increment erroneously when the internal clock is switched over. Table 13.6 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 13.6, 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.
Rev. 3.00 Jan 25, 2006 page 342 of 872
REJ09B0286-0300
Output Setting
Toggle output
1 output
0 output
No change
Conflict between Compare-Matches A and B
Switching of Internal Clocks and TCNT Operation
Priority
High
Low
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