R5S72011 RENESAS [Renesas Technology Corp], R5S72011 Datasheet - Page 646
R5S72011
Manufacturer Part Number
R5S72011
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.R5S72011.pdf
(1196 pages)
- Current page: 646 of 1196
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Section 13 8-Bit Timers (TMR)
13.8.5
If compare match events A and B occur at the same time, the 8-bit timer operates in accordance
with the priorities for the output statuses set for compare match A and compare match B, as shown
in table 13.4.
Table 13.4 Timer Output Priorities
13.8.6
TCNT may be incremented erroneously depending on when the internal clock is switched. Table
13.5 shows the relationship between the timing at which the internal clock is switched (by writing
to bits CKS1 and CKS0) and the TCNT operation.
When the TCNT clock is generated from an internal clock, the rising or falling edge of the internal
clock pulse are always monitored. Table 13.5 assumes that the falling edge is selected. If the
signal levels of the clocks before and after switching change from high to low as shown in item 3,
the change is considered as the falling edge. Therefore, a TCNT clock pulse is generated and
TCNT is incremented. This is similar to when the rising edge is selected.
The erroneous incrementation of TCNT can also happen when switching between rising and
falling edges of the internal clock, and when switching between internal and external clocks.
Rev. 2.00 Sep. 07, 2007 Page 618 of 1164
REJ09B0321-0200
Output Setting
Toggle output
1-output
0-output
No change
Conflict between Compare Matches A and B
Switching of Internal Clocks and TCNT Operation
High
Priority
Low
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