Renesas rl78 User Manual

Page of 1004
 
RL78/G1A 
 
CHAPTER  6   TIMER  ARRAY  UNIT 
R01UH0305EJ0200  Rev.2.00 
 
 
263  
Jul 04, 2013 
Figure 6-60.  Operation Procedure When Input Signal High-/Low-Level Width Measurement Function Is Used 
 
 Software 
Operation 
Hardware 
Status 
 
Power-off status 
(Clock supply is stopped and writing to each register is 
disabled.) 
Sets the TAUmEN bit of peripheral enable register 0 
(PER0) to 1.  
 
Power-on status.  Each channel stops operating. 
(Clock supply is started and writing to each register is 
enabled.) 
TAU 
default 
setting 
Sets timer clock select register m (TPSm). 
Determines clock frequencies of CKm0 to CKm3. 
 
Channel 
default 
setting 
Sets corresponding bit of noise filter enable register 1 
(NFEN1) to 0 (OFF) or 1 (ON). 
Sets timer mode register mn (TMRmn) (determines 
operation mode of channel). 
Clears the TOEmn bit to 0 and stops operation of TOmn.
Channel stops operating. 
(Clock is supplied and some power is consumed.) 
Sets the TSmn bit to 1. 
The TSmn bit automatically returns to 0 because it is a 
trigger bit. 
TEmn = 1, and the TImn pin start edge detection wait 
status is set. 
Operation 
start 
Detects the TImn pin input count start valid edge. 
Clears timer count register mn (TCRmn) to 0000H and 
starts counting up. 
During 
operation 
Set value of the TDRmn register can be changed. 
The TCRmn register can always be read. 
The TSRmn register is not used. 
Set values of the TMRmn register, TOMmn, TOLmn, 
TOmn, and TOEmn bits cannot be changed. 
When the TImn pin start edge is detected, the counter 
(TCRmn) counts up from 0000H.  If a capture edge of the 
TImn pin is detected, the count value is transferred to 
timer data register mn (TDRmn) and INTTMmn is 
generated. 
If an overflow occurs at this time, the OVF bit of timer 
status register mn (TSRmn) is set; if an overflow does not 
occur, the OVF bit is cleared.  The TCRmn register stops 
the count operation until the next TImn pin start edge is 
detected. 
Operation 
stop 
The TTmn bit is set to 1. 
The TTmn bit automatically returns to 0 because it is a 
trigger bit. 
TEmn = 0, and count operation stops. 
The TCRmn register holds count value and stops. 
The OVF bit of the TSRmn register is also held. 
TAU 
stop 
The TAUmEN bit of the PER0 register is cleared to 0.
 
 
Power-off status 
All circuits are initialized and SFR of each channel is 
also initialized. 
 
Remark  m: Unit number (m = 0), n: Channel number (n = 0 to 7 (however, timer input pin (TImn), timer output pin 
(TOmn) : n = 0, 1, 3 to 7)) 
 
Oper
ation is 
re
su
med. 
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