at32uc3b0512-z2ues ATMEL Corporation, at32uc3b0512-z2ues Datasheet - Page 618

• Manufacturer Part Number: at32uc3b0512-z2ues
• Description: 32-bit Avr Microcontroller
• Manufacturer: ATMEL Corporation

27.6.2
27.6.3
27.7
32059J–12/2010
SAB address map
Reset register
Boundary-Scan Chain
The reset register is selected by the AVR_RESET instruction and contains one bit for each reset
domain in the device. Setting each bit to one will keep that domain reset until the bit is cleared.
Note: This register is primarily intended for compatibility with other 32-bit AVR devices. Certain
operations may not function correctly when parts of the system are reset. It is generally recom-
mended to only write 0x11111 or 0x00000 to these bits to ensure no unintended side effects
occur.
The Boundary-Scan Chain has the capability of driving and observing the logic levels on the dig-
ital I/O pins, as well as driving and observing the logic levels between the digital I/O pins and the
internal logic. Typically, output value, output enable, and input data are all available in the
boundary scan chain.
The boundary scan chain is described in the BDSL (Boundary Scan Description Language) file
available at the Atmel web site.
The Service Access Bus (SAB) gives the user access to the internal address space and other
features through a 36 bits address space. The 4 MSBs identify the slave number, while the 32
LSBs are decoded within the slave’s address space. The SAB slaves are shown in
Table 27-28. SAB Slaves, addresses and descriptions.
Bit
Device ID
CPU
APP
OCD
RSERVED
Memory Service
Unallocated
Reserved
Slave
OCD
HSB
HSB
Unit
OCD
CPU
HSB and PB buses
On-Chip Debug logic and registers
No effect
4
Address [35:32]
Other
0x0
0x1
0x4
0x5
0x6
APP
3
Description
Intentionally unallocated
OCD registers
HSB memory space, as seen by the CPU
Alternative mapping for HSB space, for compatibility with
other 32-bit AVR devices.
Memory Service Unit registers
Unused
RESERVED
2
RESERVED
1
AT32UC3B
Table
CPU
LSB
0
27-28.
618