H838532H datasheet(280/508 Pages) RENESAS

280 / 508 page

Section 9 Timers

Rev. 1.00 May 30, 2008 Page 260 of 484

REJ09B0436-0100

9.5.5

Application Notes

(1) Internal Clock Switching and TCG Operation

Depending on the timing, TCG may be incremented by a switch between difference internal clock

sources. Table 9.14 shows the relation between internal clock switchover timing (by write to bits

CKS1 and CKS0) and TCG operation.

When TCG is internally clocked, an increment pulse is generated on detection of the falling edge

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

φ) or subclock (φw). For this

reason, in a case like No. 3 in table 9.14 where the switch is from a high clock signal to a low

clock signal, the switchover is seen as a falling edge, causing TCG to increment.

Table 9.14

Internal Clock Switching and TCG Operation

No.

Clock Levels Before and

After Modifying Bits CKS1

and CKS0

TCG Operation

Goes from low level to low level

Clock before

switching

Clock after

switching

Count

clock

TCG

N+1

Write to CKS1 and CKS0

Goes from low level to high level

Clock before

switching

Clock before

switching

Count

clock

TCG

N+1

N+2

Write to CKS1 and CKS0

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