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→Software pins
legend:
legend:
{| class="wikitable" style="font-family:Monospace;text-align:center;table-layout:fixed;"
{| class="wikitable" style="font-family:Monospace;text-align:center;table-layout:fixed;"
| style="background: #ff0000" | Main
| style="background: #ff0000" | SoC clock crystal
|-
| style="background: #ffaaaa" | RTC clock crystal
|-
|-
| style="background: #a060a0" | Gamecard
| style="background: #a060a0" | Gamecard
== UC CTR ==
== UC CTR ==
This MCU seems to be a customized 64 pin FLGA version of this: https://www.renesas.com/ko-kr/doc/products/mpumcu/doc/rl78/r01ds0053ej0330-rl78g14.pdf
The pin layouts are similar, but not the same
Orientation: Pin 1 marker in bottom left corner
===Hardware pins===
{| class="wikitable" style="font-family:Monospace;text-align:center;width:100%;table-layout:fixed;width:26%;"
{| class="wikitable" style="font-family:Monospace;text-align:center;width:100%;table-layout:fixed;width:26%;"
| style="background: #4d4d33" | ? || style="background: #d9ffb3" | + || style="background: #d9ffb3" | + || CHRGLED || style="background: #bbbbbb" | G || || || style="background: #bbbbbb" | G
| style="background: #d9ffb3" | + || style="background: #bbbbbb" | G || || || TP75 || style="background: #ffaaaa" | X || style="background: #ffaaaa" | X || style="background: #4d4d33" | ?
|-
|-
| || style="background: #4d4d33" | DSP_IN? || || || style="background: #bbbbbb" | G || BATTTHM || HOMEBTN ||
| style="background: #73e600" | SCL || || style="background: #bbbbbb" | G || || /RESET || style="background: #4d4d33" | ? || style="background: #4d4d33" | ? || style="background: #d9ffb3" | +
|-
|-
| || style="background: #4d4d33" | DSP_IN? || || || || || || style="background: #8efab4" | SDA
| style="background: #73e600" | SDA || || style="background: #d9ffb3" | + || TP77 || TP76 || || || style="background: #d9ffb3" | +
|-
|-
| TP75 || TP74 || TP76 || || || || || style="background: #8efab4" | SCL
| style="background: #4d4d33" | ? || || TP78 || PWRLED1 || || || || CHRGLED
|-
|-
| || || TP77 || PWRLED1 || || || PWRLED0 ||
| || || || || || || style="background: #bbbbbb" | G || style="background: #bbbbbb" | G
|-
|-
| || style="background: #bbbbbb" | G || style="background: #d9ffb3" | + || TP78 || || || ||
| || PWRBTN || || || || || BATTTHM ||
|-
|-
| style="background: #bbbbbb" | G || || || || || PWRBTN || ||
| || || || PWRLED0 || || || HOMEBTN ||
|-
|-
| TP79 || style="background: #73e600" | ? || style="background: #73e600" | ? || style="background: #4d4d33" | INT_IN || || || || style="background: #d9ffb3" | +
| style="background: #d9ffb3" | + || || || || style="background: #8efab4" | SCL || style="background: #8efab4" | SDA || || style="background: #bbbbbb" | G
|}
===Software pins===
{| class="wikitable" border="1"
! Port ID
! Pin ID
! Purpose
|-
| 020
| ??
| HOME button
|-
| 043
| ??
| Charging LED(?)
|-
| 051
| ??
| Charger "button"
|-
| 073
| ??
| Power button
|-
| 074
| ??
| WiFi button
|-
| 076
| ??
| External IRQ (MCU --> SoC)
|}
|}
|-
|-
| || || style="background: #bbbbbb" | G || || || || JACK_L || || style="background: #bbbbbb" | G || style="background: #bbbbbb" | G ||
| || || style="background: #bbbbbb" | G || || || || JACK_L || || style="background: #bbbbbb" | G || style="background: #bbbbbb" | G ||
|}
== LCD (old3DS bottom) ==
{| class="wikitable" border="1"
|-
! Pin number
! Name
! Description
|-
| 01
| -6V
|
|-
| 02
| 12V
|
|-
| 03
| CLK
| Pixel clock
|-
| 04
| /HBL
| Horizontal blank (low while blanking)
|-
| 05
| /VBL
| Vertical blank (low while blanking)
|-
| 06
| 2v2
| Loopback of pin 07?
|-
| 07
| 2v2
| Content latch? Shorting this to ground or to pin 06 will "lock" the screen memory while still allowing the screen to refresh itself.
|-
| 08
| GND
| "chassi" ground
|-
| 09
| HCL
| Horizontal clock
|-
| 10
| GND
| "chassi" ground
|-
| 11
| BIAS 1
| Default ~ 4.5V - 4.8V; sets contrast
|-
| 12
| BIAS 2
| Usually matches BIAS 1; sets "flicker"
|-
| 13
| ???
| Might be a transistor? Shorted to ground if off, 2.36V if on.
|-
| 14
| 6V
|
|-
| 15
| ???
| Loopback of pin 14 ? Shorting this with pin 14 or ground will make the 3DS turn off with a harsh pop sound.
|-
| 16
| ???
| ???
|-
| 17
| ???
| ???
|-
| 18
[...]
25
| RED 0
[...]
RED 7
| Red pixel bits
|-
| 26
| GND
| "chassi" ground
|-
| 27
[...]
34
| BLUE 7
[...]
BLUE 0
| Blue pixel bits
|-
| 35
| GND
| "chassi" ground
|-
| 36
[...]
43
| GREEN 7
[...]
GREEN 0
| Green pixel bits
|}
|}