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==Internal Busses==
===TI CC1050 to ST7 Bus===
{| class="wikitable"
!CC1050
Pin
!CC1050
Name
!ST7
Pin
!Notes/Observations
|-
|19
|DI
|Pin18 / OCMP1_A / AIN10 / PF4
|U17 appears to be a level translator between CC1050.19 and ST7.18
|-
|20
|DCLK
|Pin30 / PC7 / SS / AIN15
|U7 appears to be a level translator between CC1050.20 and ST7.30
|-
|21
|PCLK
|Pin29 / PC6 / SCK / ICCCLK
|
|-
|22
|PDATA
|Pin28 / PC5 / MOSI / AIN14
|Voltage varies between 5 and 3.something volts depending on which side is transmitting.
|-
|23
|PALE
|Pin27 / PC0 / MISO / ICCDATA
|
|}<br />
===GPS Chip to ST7 Bus===
{| class="wikitable"
!GPS
Pin
!GPS
Name
!ST7
Pin
!ST7
Name
!Notes/Observations
|-
|33
|TX_A
|1
|RDI
|TSIP@38400baud
|-
|
|
|
|
|
|-
|
|
|
|
|
|-
|
|
|
|
|
|-
|
|
|
|
|
|}
CC1050 section
SP1 connects to four channels of U14, an 8-channel analog MUX. Pin 2 also connects to R111, non-populated, which would provide a pull-up to +5 at Pin 1.
==Components==
The following is a catalog of active components. Designators italicized still need positive identification; bold have been positively identified. Markings listed where known to help in identification. List additional markings when they differ.
GPS xRESET - connected to 3.3v
== CC1050 Subsystem ==
{| class="wikitable"
!CC1050
Pin
!CC1050
Name
!ST7
Pin
!Notes/Observations
|-
|19
|DI
|Pin18 / OCMP1_A / AIN10 / PF4
|U17 appears to be a level translator between CC1050.19 and ST7.18
|-
|20
|DCLK
|Pin30 / PC7 / SS / AIN15
|U7 appears to be a level translator between CC1050.20 and ST7.30
|-
|21
|PCLK
|Pin29 / PC6 / SCK / ICCCLK
|
|-
|22
|PDATA
|Pin28 / PC5 / MOSI / AIN14
|Voltage varies between 5 and 3.something volts depending on which side is transmitting.
|-
|23
|PALE
|Pin27 / PC0
|
|}
[https://github.com/rsaxvc/LMS6APRS/blob/master/docs/cc1050%20frequency%20calculator.ods?raw=true CC1050 Frequency Register Calculator based on 14.7456MHz crystal]
==Test Points==
