DS4830EVKIT# Maxim Integrated, DS4830EVKIT# Datasheet - Page 20

• Manufacturer Part Number: DS4830EVKIT#
• Description: Development Boards & Kits - Other Processors DS4830 Eval Kit
• Manufacturer: Maxim Integrated

Specifications of DS4830EVKIT#

• Rohs: yes
• Product: Evaluation Kits
• Tool Is For Evaluation Of: DS4830
• Interface Type: I2C
• Operating Supply Voltage: 3 V to 3.6 V
• Part # Aliases: 90-4830T#EVK

applications that cannot afford downtime. Alternatively, it
allows the application to develop custom loader software
that can operate under the control of the application soft-
ware. The utility ROM contains firmware-accessible flash
programming functions that erase and program flash
memory. These functions are described in detail in the
DS4830 User’s Guide.
Sets of registers control most device functions. These
registers provide a working space for memory opera-
tions as well as configuring and addressing peripheral
registers on the device. Registers are divided into two
major types: system registers (special-purpose registers,
or SPRs) and peripheral registers (special-function reg-
isters, or SFRs). The common register set, also known
as the system registers, includes the ALU, accumulator
registers, data pointers, interrupt vectors and control,
and stack pointer. The peripheral registers define addi-
tional functionality, and the functionality is broken up
into discrete modules. Both the system registers and the
peripheral registers are described in detail in the DS4830
User’s Guide.
The device generates its 10MHz instruction clock (MOSC)
internally using a ring oscillator. On power-up, the oscil-
lator’s output (which cannot be accessed externally) is
disabled until V
is reached, the output is enabled after approximately
1ms, clocking the device. See
Figure 8. System Timing
Maxim Integrated
CLOCK
CORE
V
DD
DD
rises above V
V
BO
Figure
System Timing
BO
. Once this threshold
Register Set
8.
~1ms
The device features several sources that can be used to
reset the DS4830.
An internal power-on-reset (POR) circuit is used to
enhance system reliability. This circuit forces the device
to perform a POR whenever a rising voltage on V
climbs above V
events occur:
• All registers and circuits enter their reset state.
• The POR flag (WDCN.7) is set to indicate the source
• Code execution begins at location 8000h when the
The device features a brownout detect/reset function.
Whenever the power monitor detects a brownout condi-
tion (when V
stays in that state as long as V
Once V
for t
referred to as CPU state. If a brownout occurs during
t
state. Otherwise, it enters into CPU state. In CPU state,
the brownout detector is also enabled.
On power-up, the device always enters brownout state
first and then follows the above sequence. The reset
issued by brownout is the same as POR. Any action
performed after POR also happens on brownout reset.
SU:MOSC
Optical Microcontroller
of the reset.
reset condition is released.
SU:MOSC
DD
, the device again goes back to the brownout
voltage rises above V
DD
before returning to normal operation, also
< V
BO
BO
. When this happens the following
), it immediately issues a reset and
Brownout Detect/Reset
DD
System Reset
BO
Power-On Reset
remains below V
, the device waits
DS4830
BO
DD
20
.