There are 4 timers.
Registers
| Old3DS | Name | Address | Width | Used by |
|---|---|---|---|---|
| Yes | TIMER_VAL(n) | 0x10003000 + 4*n | 2 | |
| Yes | TIMER_CNT(n) | 0x10003002 + 4*n | 2 |
TIMER_VAL
Writing to REG_TMxVAL loads a starting value for one of the 4 timers, while reading it will show the current timer value.
TIMER_CNT
| BIT | DESCRIPTION |
|---|---|
| 0-1 | Prescaler select (0=F/1, 1=F/64, 2=F/256, 3=F/1024) |
| 2 | Count-up (0=Disabled, 1=Enabled) |
| 3-5 | Not used |
| 6 | IRQ enable (0=Disabled, 1=IRQ on timer value overflow) |
| 7 | Start/Stop (0=Stop, 1=Start) |
Count-up
When count-up is enabled, the timer value will increase every time the previous timer overflows.