BCM2835 Datasheet PDF - Broadcom Corporation

BCM2835 contains the following peripherals which may safelybe accessed by the ARM:
•  Timers
•  Interrupt controller
•  GPIO
•  USB
•  PCM / I2S
•  DMA controller
•  I2C master
•  I2C / SPI slave
•  SPI0, SPI1, SPI2
•  PWM
•  UART0, UART1