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S5L8720 Timers (Hardware)
Contents
S5L8720 Timer Hardware
Base Address: 0x3C700000
Common Registers
| Register | Function |
|---|---|
| 0x118 | Timer 4-7 IRQ Status, write to clear interrupt request |
IRQ Status Register (0x118)
| Bit | Access | Function |
|---|---|---|
| 2-0 | R | Timer 7 Flags (execute handler 1 to 3) |
| 7-3 | x | No Function / Unknown |
| 10-8 | R | Timer 6 Flags (execute handler 1 to 3) |
| 15-11 | x | No Function / Unknown |
| 18-16 | R | Timer 5 Flags (execute handler 1 to 3) |
| 23-19 | x | No Function / Unknown |
| 26-24 | R | Timer 4 Flags (execute handler 1 to 3) |
| 31-27 | x | No Function / Unknown |
RW: Read/Write Access, x: Don't know
RTC Registers
| Register | Function |
|---|---|
| 0x80 | RTC Ticks High |
| 0x84 | RTC Ticks Low |
| 0x88 | On init: 0xA, then after the others: 0x18010 |
| 0x8C | On init: 0xFFFFFFFF |
| 0x90 | On init: 0xFFFFFFFF |
| 0x94 | On init: 0xFFFFFFFF |
| 0x98 | On init: 0xFFFFFFFF |
Timers
Timer Bases
| TimerNumber | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
|---|---|---|---|---|---|---|---|---|
| Base | 0x0 | 0x20 | 0x40 | 0x60 | 0xA0 | 0xC0 | 0xE0 | 0x100 |
| Width | 16Bit | 16Bit | 16Bit | 16Bit | 32Bit | 32Bit | 32Bit | 32Bit |
Timer Registers
| Register | Name |
|---|---|
| 0x00 | Config Register |
| 0x04 | Control Register |
| 0x08 | Compare Buffer Register (TCMPB) |
| 0x0C | Counter Buffer register (TCNTB) |
| 0x10 | 10-Bit Prescaler |
| 0x14 | Observation Register (TCNTO) |
Register Description
Config Register
| Bit | Access | Function | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2-0 | x | No Function / Unknown | |||||||||
| 3 | RW | Switches Bit 23 (TOUT) randomly if set... | |||||||||
| 4 | RW | Compare Mode: Counter runs up to TCMPB (Modebit 0) | |||||||||
| 5 | RW | Auto-Reload: (Modebit 1)
| |||||||||
| 6 | RW | Clock Select
| |||||||||
| 7 | RW | Unknown | |||||||||
| 10-8 | RW | Divider | |||||||||
| 11 | RW | Invert TOUT | |||||||||
| 14-12 | RW | Unknown | |||||||||
| 15 | x | No Function / Unknown | |||||||||
| 22-16 | x | Unknown | |||||||||
| 23 | RW | Timer Out (TOUT)
| |||||||||
| 24 | RW | Counting Direction: 0 = Up, 1 = Down (Only on Timer 4-7) | |||||||||
| 27-25 | x | No Function / Unknown | |||||||||
| 28 | RW | When counting down, count down starting at TCMPB (Only on Timer 4-7) | |||||||||
| 31-29 | x | No Function / Unknown |
RW: Read/Write Access, x: Don't know
Control Register
| Bit | Access | Function |
|---|---|---|
| 0 | RW | Start / Stop |
| 1 | RW | Manual Update |
| 3-2 | x | No Function/ Unknown |
| 4 | RW | Resets all counter registers to 0 |
| 31-5 | x | No Function/ Unknown |
RW: Read/Write Access, x: Don't know
References
Information gathered from:
- Reversing iBoot
- openiBoot
- Playing with the registers when iBoot is running
