45111 Datasheet, PDF (40/184 Pages) List of Unclassifed Manufacturers – 14-DAY MONEY BACK GUARANTEE

6 The Device Window
NOTE: To select an SX20 device, click on the SX18 selection. SX18 devices are no longer manufactured
by Ubicom
The Oscillator section specifies the fuse settings for the various clock sources, and oscillator modes that
are available in the SX devices, similar to the directives that can be given in the source code. Please note
that any fuse settings defined in the source code will be overwritten by the options selected here when
the SX controller is programmed from the Device window. See Table 4 - SX Clock Options, below, for a
summary of the available clock options.
Setting
HS1…3
XT1…2
LP1…2
External RC
Internal
32 KHz…4 MHz
Table 4 - SX Clock Options
Description
Specifies the oscillator drive capacity for high speed, medium speed crystal/resonator, and low power
crystal/resonator clocks.
Specifies special drive for external resistor-capacitor clock circuits.
Specifies internal clock at indicated frequency.
In the Brownout section, you can specify the threshold voltage for a brownout reset or you may also turn
off brownout detection completely.
The Reset Timer section (SX48/52 devices only) should be set to the desired reset delay. The reset delay
is the amount of time the SX48/52 waits after a reset condition before executing the first program
instruction. This setting is useful for enabling a faster response after a sleep operation. It is critical to
test this with your final circuit since the reset delay is intended to make sure the external oscillator
(crystal, resonator, R/C circuit, etc) is running and stabilized before the first instruction executes.
The Options section allows you to set various fuse options. Turbo mode and enhanced Stack + OPTION
can only be selected for SX20/28 devices because SX48/52 devices always have these options active,
whereas the Sleep Clock option can only be selected for SX48/52 devices.
When you activate the Code Protect feature, the contents of the SX chip (except for the ID) cannot be read
back once it is programmed. Actually, when you read a code-protected device, meaningless data will be
read back instead.
The ID and E²Flash sections display the values contained in the ID and E²Flash memory (the program
memory) respectively.
The Program button initiates programming the SX chip with the assembled source code or the object
code loaded into the Device window.
Use the Verify and Read buttons to verify the code in the SX against that shown in the Device window or
to simply read the SX’s code into the Device window. These options are valuable should the code in an
SX chip be questionable or unknown. Note that verifies will fail and reads will not reveal the true code
Page 40 • SX-Key/Blitz Development System Manual 2.0 • Parallax, Inc.