Renesas RL78/G1P, Hardware User Manual, Page: 154 / 770

RL78/G1P CHAPTER 6 TIMER ARRAY UNIT
R01UH0895EJ0100 Rev.1.00 135
Nov 29, 2019
6.2.1 Timer count register mn (TCRmn)
The TCRmn register is a 16-bit read-only register and is used to count clocks.
The value of this counter is incremented or decremented in synchronization with the rising edge of a count clock.
Whether the counter is incremented or decremented depends on the operation mode that is selected by the MDmn3 to
MDmn0 bits of timer mode register mn (TMRmn) (see
6.3.3 Timer mode register mn (TMRmn)
).
Figure 6-6. Format of Timer Count Register mn (TCRmn)
Address: F0180H, F0181H (TCR00) to F0186H, F0187H (TCR03) After reset: FFFFH R
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
TCRmn
Remark
m: Unit number (m = 0), n: Channel number (n = 0 to 3)
The count value is set to FFFFH in the following cases.

When the reset signal is generated

When the TAUmEN bit of peripheral enable register 0 (PER0) is cleared

When counting of the slave channel has been completed in the PWM output mode

When counting of the slave channel has been completed in the delay count mode

When counting of the master/slave channel has been completed in the one-shot pulse output mode

When counting of the slave channel has been completed in the multiple PWM output mode
The count value is cleared to 0000H in the following cases.

When the start trigger is input in the capture mode

When capturing has been completed in the capture mode
Caution The count value is not captured to timer data register mn (TDRmn) even when the TCRmn
register is read.
The TCRmn register read value differs as follows according to operation mode changes and the operating status.
Table 6-2. Timer Count Register mn (TCRmn) Read Value in Various Operation Modes
Operation Mode Count Mode Timer Count Register mn (TCRmn) Read Value
Note
Value if the
operation mode
was changed
after releasing
reset Value if the Operation
was restarted after
count operation
paused (TTmn = 1) Value if the operation
mode was changed
after count operation
paused (TTmn = 1)
Value when waiting
for a start trigger
after one count
Interval timer mode Count down FFFFH Value if stop Undefined

Capture mode Count up 0000H Value if stop Undefined

Event counter mode Count down FFFFH Value if stop Undefined

One-count mode Count down FFFFH Value if stop Undefined FFFFH
Capture & one-count
mode Count up 0000H Value if stop Undefined Capture value of
TDRmn re 1
Note
This indicates the value read from the TCRmn register when channel n has stopped operating as a timer (TEmn =
0) and has been enabled to operate as a counter (TSmn = 1). The read value is held in the TCRmn register until
the count operation starts.
Remark
m: Unit number (m = 0), n: Channel number (n = 0 to 3)
F0181H (TCR00)
F0180H (TCR00)