Zilog ZUSBOPTS - Manual (Page 358)

Debug Windows UM017105-0511
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Zilog Developer Studio II – ZNEO™
User Manual
Special Function Registers Window
Click the Special Function Registers Window button to open up to ten Special Function
Registers windows. Each Special Function Registers window, shown in Figure 139, dis-
plays the special function registers in the standard ZNEO architecture that belong to the
selected group. Addresses
F00 through FFF are reserved for special function registers
(SFRs).
Use the Group drop-down list to view a particular group of SFRs.
There are several SFRs that, when read, are cleared or clear an associated register. To pre-
vent the debugger from changing the behavior of the code, a special group of SFRs was
created that groups these state changing registers. The group is called SPECIAL_CASE.
If this group is selected, the behavior of the code changes, and the program must be reset.
To use the FLASH_OPTIONBITS group, you must reset the device for the changes to
take effect. Use the FLASH_OPTIONBITS group to view the values of all of the Flash
option bit registers, with the exception of the following registers:
•
Temperature sensor trim register
•
Precision oscillator trim register
•
Flash capacity configuration register

To change special function register values, perform the following brief procedure.
Figure 139. Special Function Registers Window
Notes: