Note. The xr68681 is clocked at 7.3728MHz, meaning you'll get double the baud rate listed in the data sheet as the datasheet assumes ha;f that rate. It will also affect the internal counter when it's clocked by the external clock.
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:::
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```C
int _char_available(void);
char _getchar(void);
void _putchar(char c);
```
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::: info
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Note. The xr68681 is clocked at 7.3728MHz, meaning you'll get double the baud rate listed in the data sheet as the datasheet assumes ha;f that rate. It will also affect the internal counter when it's clocked by the external clock.
+
:::
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## LED Control
There's a block of 10 leds (LD7 on the SBC3-b3), and six of them can be used for anything you like. Led1 is furthest from the cpu: