H8S2245 datasheet(426/818 Pages) RENESAS

tên linh kiện	H8S2245

Giải thích chi tiết về linh kiện	Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series

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Section 10 8-Bit Timers

Rev.3.00 Mar. 26, 2007 Page 384 of 772

REJ09B0355-0300

10.6.5

Contention between Compare Matches A and B

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 10.4.

Table 10.4

Timer Output Priorities

Output Setting

Priority

Toggle output

High

1 output

0 output

No change

Low

10.6.6

Switching of Internal Clocks and TCNT Operation

TCNT may increment erroneously when the internal clock is switched over. Table 10.5 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 case 3 in

table 10.5, a TCNT clock pulse is generated on the assumption that the switchover is a falling

edge. This increments TCNT.

The erroneous incrementation can also happen when switching between internal and external

clocks.

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