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RL78/G1A CHAPTER 6 TIMER ARRAY UNIT
R01UH0305EJ0200 Rev.2.00 245
Jul 04, 2013
Figure 6-44. Operation Procedure of Interval Timer/Square Wave Output Function (1/2)
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.
Sets timer mode register mn (TMRmn) (determines
operation mode of channel).
Sets interval (period) value to timer data register mn
(TDRmn).
Channel stops operating.
(Clock is supplied and some power is consumed.)
Channel
default
setting
To use the TOmn output
Clears the TOMmn bit of timer output mode register m
(TOMm) to 0 (master channel output mode).
Clears the TOLmn bit to 0.
Sets the TOmn bit and determines default level of the
TOmn output.
Sets the TOEmn bit to 1 and enables operation of TOmn.
Clears the port register and port mode register to 0.
The TOmn pin goes into Hi-Z output state.
The TOmn default setting level is output when the port mode
register is in the output mode and the port register is 0.
TOmn does not change because channel stops operating.
The TOmn pin outputs the TOmn set level.
Operation
start
(Sets the TOEmn bit to 1 only if using TOmn output and
resuming operation.).
Sets the TSmn (TSHm1, TSHm3) bit to 1.
The TSmn (TSHm1, TSHm3) bit automatically returns
to 0 because it is a trigger bit.
TEmn (TEHm1, TEHm3) = 1, and count operation starts.
Value of the TDRmn register is loaded to timer count
register mn (TCRmn). INTTMmn is generated and TOmn
performs toggle operation if the MDmn0 bit of the TMRmn
register is 1.
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 TOm and TOEm registers can be
changed.
Set values of the TMRmn register, TOMmn, and TOLmn
bits cannot be changed.
Counter (TCRmn) counts down. When count value reaches
0000H, the value of the TDRmn register is loaded to the
TCRmn register again and the count operation is continued.
By detecting TCRmn = 0000H, INTTMmn is generated and
TOmn performs toggle operation.
After that, the above operation is repeated.
The TTmn (TTHm1, TTHm3) bit is set to 1.
The TTmn (TTHm1, TTHm3) bit automatically returns
to 0 because it is a trigger bit.
TEmn (TEHm1, TEHm3), and count operation stops.
The TCRmn register holds count value and stops.
The TOmn output is not initialized but holds current status.
Operation
stop
The TOEmn bit is cleared to 0 and value is set to the TOmn bit.
The TOmn pin outputs the TOmn bit set level.
(Remark is listed on the next page.)
Operation is resumed.
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