Difference between revisions of "S5L8720 Timers (Hardware)"

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==S5L8720 Timer Hardware==
 
Base Address: 0x3C700000
 
   
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==Common Registers==
 
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{| style="width:100%" border="1"
 
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!align="left" width="100px" |Register
 
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!align="left" |Function
 
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|-
 
|align="left" width="100px" |0x118
 
|align="left" |Timer 4-7 IRQ Status, write to clear interrupt request
 
|}
 
   
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====IRQ Status Register (0x118)====
 
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{| style="width:100%" border="1"
 
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!align="left" width="100px" |Bit
 
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!align="left" width="60px" |Access
 
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!align="left" |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
 
   
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==RTC Registers==
 
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{| style="width:100%" border="1"
 
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!align="left" width="100px" |Register
 
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!align="left" |Function
 
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|-
 
|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
 
|}
 
   
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==Timers==
 
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===Timer Bases===
 
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{| style="width:100%" border="1"
 
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!align="left" width="100px" |TimerNumber
 
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! 0 !! 1 !! 2 !! 3 !! 4 !! 5 !! 6 !! 7
 
|-
 
|Base ||align="center"| 0x0 ||align="center"| 0x20 ||align="center"| 0x40 ||align="center"| 0x60
 
|align="center"| 0xA0 ||align="center"| 0xC0 ||align="center"| 0xE0 ||align="center"| 0x100
 
|-
 
|Width ||align="center"| 16Bit ||align="center"| 16Bit ||align="center"| 16Bit ||align="center"| 16Bit
 
|align="center"| 32Bit ||align="center"| 32Bit ||align="center"| 32Bit ||align="center"| 32Bit
 
|}
 
   
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===Timer Registers===
 
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{| style="width:100%" border="1"
 
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!align="left" width="100px" |Register
 
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!align="left" |Name
 
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|-
 
|0x00
 
|Config Register
 
|-
 
|0x04
 
|Control Register
 
|-
 
|0x08
 
|Compare Buffer Register (TCMPB)
 
|-
 
|0x0C
 
|Counter Buffer register (TCNTB)
 
|-
 
|0x10
 
|10-Bit Prescaler
 
|-
 
|0x14
 
|Observation Register (TCNTO)
 
|}
 
   
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===Register Description===
 
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====Config Register====
 
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{| style="width:100%" border="1"
 
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!align="left" width="100px" |Bit
 
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!align="left" width="60px" |Access
 
!align="left" |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)
 
{|
 
|1 = One-Shoot
 
|-
 
|0 = Interval Mode
 
|-
 
|Counter runs up to TCMPB
 
|}
 
|-
 
|6||RW||Clock Select
 
{|
 
|0 ||=>||align="right"|133MHz Timer Clock
 
|-
 
|1 and Divider = 1 and Prescaler = 0 ||=>||align="right"|133MHz Timer Clock
 
|-
 
|1 and (Divider > 1 or Prescaler > 0) ||=>||align="right"|24MHz Timer Clock
 
|}
 
|-
 
|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)
 
{|
 
|In mode 0x00: Bit 23 = Toggle when TCNT = 0
 
|-
 
|In mode 0x01: Bit 23 = (TCNT >= TCMP)
 
|-
 
|In mode 0x10: Bit 23 = (TCNT >= TCMP)
 
|-
 
|In mode 0x11: Bit 23 = Toggle when TCNT = TCMP
 
|}
 
|-
 
|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
 
   
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====Control Register====
 
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{| style="width:100%" border="1"
 
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!align="left" width="100px" |Bit
 
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!align="left" width="60px" |Access
 
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!align="left" |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
 
   
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==References==
 
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Information gathered from:
 
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*Reversing iBoot
 
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*openiBoot
 
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*Playing with the registers when iBoot is running
 
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Revision as of 06:24, 7 November 2009

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