RL78/G10 CHAPTER 6 TIMER ARRAY UNIT
R01UH0384EJ0311 Rev. 3.11 167
Dec 22, 2016
Figure 6-47. Procedure for Operating External Event Counter
Software Operation Hardware Status
TAU
default
setting
Power-off status
(Clock supply is stopped and writing to SFR of the TAU
is disabled.)
Sets the TAU0EN bit of peripheral enable register 0
(PER0) to 1 (when the TAU0EN bit is 0, read/write
operation is disabled).
Power-on status. Each channel stops operating.
(Clock supply is started and writing to SFR of the TAU is
enabled.)
Sets timer clock select register 0 (TPS0).
Determines operating clock (CK00 and CK01) for each
channel.
Channel
default
setting
Sets noise filter enable register 1 (NFEN1).
Sets timer mode register 0n (TMR0n) (determines
operation mode for each channel and selects the
detection edge).
Sets number of counts in the timer data register 0n
(TDR0n) (for the access procedure to the TDR0nH and
TDR0nL registers, see 6.2.2 Timer data register 0n
(TDR0n)).
Clears the target bit of timer output mode register 0
(TOM0) to 0 (master channel output mode).
Clears the target bit of the TOL0 register to 0.
Clears the target bit of timer output enable register 0
(TOE0) to 0.
Channel stops operating.
Operation
start
Sets the target bit of TS0 register to 1.
The target bit of TS0 register automatically returns to 0
because it is a trigger bit.
The target bit of TE0 register is set to 1, and count
operation starts.
Value of the TDR0n register is loaded to timer count
register 0n (TCR0n) and detection of the TI0n pin input
edge is awaited.
During
operation
The set value of the TDR0n register can be changed.
The TCR0n register can always be read (for the access
procedure to the TCR0nH and TCR0nL registers, see
6.2.1 Timer counter register 0n (TCR0n)).
The set values in the target bits of the TMR0n, TO0,
TOE0, TOM0, and TOL0 registers cannot be changed.
Counter (TCR0n) counts down each time input edge of the
TI0n pin has been detected. When count value reaches
0000H, the value of the TDR0n register is loaded to the
TCR0n register again, and the count operation is
continued. By detecting TCR0n = 0000H, the INTTM0n is
generated.
After that, the above operation is repeated.
Operation
stop
Sets the target bit of TT0 register to 1.
The target bit of TT0 automatically returns to 0
because it is a trigger bit.
The target bit of TE0 register is cleared to 0, and count
operation stops.
The TCR0n register holds count value and stops.
TAU
stop
Clears the TAU0EN bit of the PER0 register to 0.
Power-off status
(Clock supply is stopped and SFR of the TAU is
initialized.)
Remark n: Channel number
n = 0, 1 (for 10-pin products); n = 0 to 3 (for 16-pin products)
Operation is resumed.
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