6.5.1 Count clock (f
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RL78/G13
CHAPTER 6 TIMER ARRAY UNIT
R01UH0146EJ0100 Rev.1.00
362
Sep 22, 2011
6.5 Operation Timing of Counter
6.5.1 Count clock (fTCLK)
The count clock (fTCLK) of the timer array unit can be selected between following by CCSmn bit of timer mode register
mn (TMRmn). .
Operation clock (fMCK) specified by the CKSmn0 and CKSmn1 bits
Valid edge of input signal input from the TImn pin
Because the timer array unit is designed to operate in synchronization with fCLK, the timings of the count clock (fTCLK) are
shown below.
(1) When operation clock (fMCK) specified by the CKSmn0 and CKSmn1 bits is selected (CCSmn = 0)
The count clock (fTCLK) is between fCLK to fCLK /2
15 by setting of timer clock select register m (TPSm). When a
divided fCLK is selected, however, the count clock is not a signal which is simply divided fCLK by 2
m, but a signal
which becomes high level for one period of fCLK from its rising edge (m = 1 to 15).
Counting of timer count register mn (TCRmn) delayed by one period of fCLK from rising edge of the count clock,
because of synchronization with fCLK. But, this is described as 鈥渃ounting at rising edge of the count clock鈥�, as a
matter of convenience.
Figure 6-21. Timing of fCLK and count clock (fTCLK) (When CCSmn = 0)
Remarks 1.
: Rising edge of the count clock
: Synchronization, increment/decrement of counter
2.
fCLK: CPU/peripheral hardware clock
fCLK
fTCLK
( = fMCK
= CKmn)
fCLK/2
fCLK/4
fCLK/8
fCLK/16
鐩搁棞(gu膩n)PDF璩囨枡
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