TIMER Registers
Jump to navigation
Jump to search
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.
There are 4 timers. These timers run at a frequency of 67,027,964.0 ± 2-32 Hz (i.e. exactly half the ARM9 clock frequency).
Registers
| Old3DS | Name | Address | Width | Used by |
|---|---|---|---|---|
| Yes | TIMER_VAL(n) | 0x10003000 + 4*n | 2 | Boot9, Kernel9 |
| Yes | TIMER_CNT(n) | 0x10003002 + 4*n | 2 | Boot9, Kernel9 |
TIMER_VAL
Writing to TIMER_VAL loads a starting value for one of the 4 timers, while reading it will show the current timer value.
TIMER_CNT
| Bit | Description |
|---|---|
| 1-0 | Prescaler select (0=F/1, 1=F/64, 2=F/256, 3=F/1024) |
| 2 | Count-up (0=Disabled, 1=Enabled) |
| 5-3 | 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.