Adding more information about the peripheral devices and how they connect

Hardware/Device Specifications.markdown

@@ -21,6 +21,7 @@
 - 1.8 V to 5.5 V Supply Voltage
 - Notable Peripherals:
   - I2C
+    - Slave only
     - Clock rate up to 400 kHz
 
 
@@ -29,9 +30,18 @@
 
 - 3.0 V to 3.6 V Supply Voltage
 - Notable Peripherals:
-  - I2C
+  - I2C (2)
+    - Master or Slave
+    - 100 kbit/s or 400 kbit/s
+    - 7-bit/10-bit addressing mode
   - SPI
-  - UART
+    - SPI, HSPI and VSPI
+    - Master or Slave
+    - 1-line full-duplex and 1/2/4-line half-duplex
+    - Up to 80 MHz
+    - Up to 64-byte FIFO
+  - UART (3)
+    - Up to 5 Mbps
 
 
 
@@ -41,6 +51,8 @@
 
 - Notable Peripherals:
   - SPI
+    - Slave only
+    - Need to calculate frequency
 
 
 
@@ -49,6 +61,7 @@
 - 2.7 V to 5.5 V Supply Voltage
 - Notable Peripherals:
   - SPI
+    - Slave (Assuming only option)
     - 10 MHz