AT32UC3B0512-A2UES ATMEL [ATMEL Corporation], AT32UC3B0512-A2UES Datasheet - Page 33

• Manufacturer Part Number: AT32UC3B0512-A2UES
• Description: 32-bit AVR Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

Table 7-2.
7.4
CPU Local Bus Mapping
Peripheral Address Mapping
0xFFFF3C00
0xFFFF4000
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.
The following GPIO registers are mapped on the local bus:
Table 7-3.
Port
0
1
Register
Output Driver Enable Register (ODER)
Output Value Register (OVR)
Pin Value Register (PVR)
Output Driver Enable Register (ODER)
Output Value Register (OVR)
Pin Value Register (PVR)
Local bus mapped GPIO registers
ABDAC
ADC
Analog to Digital Converter - ADC
Audio Bitstream DAC - ABDAC
Mode
WRITE
SET
CLEAR
TOGGLE
WRITE
SET
CLEAR
TOGGLE
-
WRITE
SET
CLEAR
TOGGLE
WRITE
SET
CLEAR
TOGGLE
-
Local Bus
Address
0x4000_0040
0x4000_0044
0x4000_0048
0x4000_004C
0x4000_0050
0x4000_0054
0x4000_0058
0x4000_005C
0x4000_0060
0x4000_0140
0x4000_0144
0x4000_0148
0x4000_014C
0x4000_0150
0x4000_0154
0x4000_0158
0x4000_015C
0x4000_0160
Access
Write-only
Write-only
Write-only
Write-only
Write-only
Write-only
Write-only
Write-only
Read-only
Write-only
Write-only
Write-only
Write-only
Write-only
Write-only
Write-only
Write-only
Read-only