Renesas rl78 User Manual

Page of 1004
 
RL78/G1A 
 
CHAPTER  6   TIMER  ARRAY  UNIT 
R01UH0305EJ0200  Rev.2.00 
 
 
240  
Jul 04, 2013 
6.7.3  Cautions on channel input 
When timer input pins are not used, the operating clock is not supplied to the noise filters.  When use of a timer input 
pin is specified, therefore, the system must wait for the time shown below until the channel operation enable trigger flag for 
the channel corresponding to the timer input pin is set. 
 
(1)  When the noise filter is disabled 
If bit 12 (CCSmn), bit 9 (STSmn1), or bit 8 (STSmn0) of timer mode register mn (TMRmn) is set when all of these 
bits are 0, wait for at least two cycles of the operating clock (f
MCK
), and then set the corresponding timer operation 
enable trigger flag of the timer channel start register (TSm). 
 
(2)  When the noise filter is enabled 
If bit 12 (CCSmn), bit 9 (STSmn1), or bit 8 (STSmn0) of timer mode register mn (TMRmn) is set when all of these 
bits are 0, wait for at least four cycles of the operating clock (f
MCK
), and then set the corresponding timer operation 
enable trigger flag of the timer channel start register (TSm).