– USART4 Transmit Channel
– USART3 Transmit Channel
– USART2 Transmit Channel
– USART1 Transmit Channel
– USART0 Transmit Channel
– SPI1 Transmit Channel
– SPI0 Transmit Channel
– SSC Transmit Channel
– TWI Receive Channel
– DBGU Receive Channel
– USART5 Receive Channel
– USART4 Receive Channel
– USART3 Receive Channel
– USART2 Receive Channel
– USART1 Receive Channel
– USART0 Receive Channel
– ADC Receive Channel
– SPI1 Receive Channel
– SPI0 Receive Channel
– SSC Receive Channel
– MCI Transmit/Receive Channel
7.4 Debug and Test Features
• ARM926 Real-time In-circuit Emulator
– Two real-time Watchpoint Units
– Two Independent Registers: Debug Control Register and Debug Status Register
– Test Access Port Accessible through JTAG Protocol
– Debug Communications Channel
• Debug Unit
– Two-pin UART
– Debug Communication Channel Interrupt Handling
– Chip ID Register
• IEEE1149.1 JTAG Boundary-scan on All Digital Pins
18 AT91SAM9G20 Summary
6384CS–ATARM–11-Mar-09