Datasheet

AT32UC3A

10.2 CPU Local Bus Mapping

Some of the registers in the GPIO module are mapped onto the CPU local bus, in addition to

being mapped on the Peripheral Bus. These registers can therefore be reached both by

accesses on the Peripheral Bus, and by accesses on the local bus.

Mapping these registers on the local bus allows cycle-deterministic toggling of GPIO pins since

the CPU and GPIO are the only modules connected to this bus. Also, since the local bus runs at

CPU speed, one write or read operation can be performed per clock cycle to the local bus-

mapped GPIO registers.

0xFFFF1C00

USART2

Universal Synchronous Asynchronous Receiver

Transmitter - USART2

PBA

0xFFFF2000

USART3

Universal Synchronous Asynchronous Receiver

Transmitter - USART3

PBA

0xFFFF2400

SPI0 Serial Peripheral Interface - SPI0 PBA

0xFFFF2800

SPI1 Serial Peripheral Interface - SPI1 PBA

0xFFFF2C00

TWI Two Wire Interface - TWI PBA

0xFFFF3000

PWM Pulse Width Modulation Controller - PWM PBA

0xFFFF3400

SSC Synchronous Serial Controller - SSC PBA

0xFFFF3800

TC Timer/Counter - TC PBA

0xFFFF3C00

ADC Analog To Digital Converter - ADC PBA

Table 10-1. Peripheral Address Mapping (Continued)

Address Peripheral Name Bus

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