HD6433644R datasheet(255/549 Pages) RENESAS

255 / 549 page

Section 9 Timers

Rev. 6.00 Sep 12, 2006 page 235 of 526

REJ09B0326-0600

Contention between Compare Match A and B: If compare match A and B occur

simultaneously, any conflict between the output selections for compare match A and compare

match B is resolved by following the priority order in table 9.12.

Table 9.12 Timer Output Priority Order

Output Setting

Priority

Toggle output

High

1 output

0 output

No change

Low

Internal Clock Switching and Counter Operation: Depending on the timing, TCNTV may be

incremented by a switch between different internal clock sources. Table 9.13 shows the relation

between internal clock switchover timing (by writing to bits CKS1 and CKS0) and TCNTV

operation.

When TCNTV is internally clocked, an increment pulse is generated from the falling edge of an

internal clock signal, which is divided from the system clock (

φ). For this reason, in a case like

No. 3 in table 9.13 where the switch is from a high clock signal to a low clock signal, the

switchover is seen as a falling edge, causing TCNTV to increment.

TCNTV can also be incremented by a switch between internal and external clocks.

HD6433644R Datasheet(PDF) 255 Page - Renesas Technology Corp