Maxim Integrated MAX32600, Руководство пользователя

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MAX32600 User’s Guide Introduction 2.3 Power Supplies and Modes
With the core instantiation parameters given above, the NVIC will support up to 48 distinct interrupt sources (including internal and external interrupts), with pro-
grammable interrupt priority of eight priority levels (3-bit width).
2.2.6 ARM Debug
The MAX32600 includes the standard JTAG debug engine as implemented for the Cortex-M3 ARM core. The JTAG TAP interface is supported, but the serial wire
interface is not.
Since this is a standard ARM core component, it is instantiated ‘as-is’ along with the rest of the Cortex-M3 core and cannot be modified to support special requirements
for the
MAX32600
design. Accordingly, there are two separate JTAG TAP engines on the
MAX32600
- the ARM Debug JTAG and the Maxim Test JTAG. The two
JTAG TAP ports share the same pins; the TSEL pin is used to switch access between the two of them.
The JTAG TAP device address for the MAX32600 is 0x4BA00477.
Standard features supported by the ARM JTAG debug engine include the ability to set up to six breakpoints and two watchpoints, access main system memory and
peripheral registers even when the CPU is running, and pause, trace, or reset the CPU. Because the debug engine is coupled to the CPU only for clocking and reset
purposes, if the debug engine pauses the CPU it is important to note that other peripherals and functions on the
MAX32600 are not paused and continue to operate
normally.
2.3 Power Supplies and Modes
2.3.1 Digital Supply Voltages
The
MAX32600
operates from a main digital supply voltage of 1.8V to 3.6V (V
DD
). For portable electronic systems, this supply is typically provided by a battery.
Generated supplies V
DDIO
and V
REG18
are switched automatically to draw from V
DDB
when the USB power supply is present, and from V
DD
when USB is not
powered/connected. V
DDIO
is externally available to power GPIO and GPIO-multiplexed peripheral I/O. V
REG18
is internally regulated to 1.8V and provides power to
the digital core; it is also an external option to power GPIO. The POR, power-fail reset, and power fail warning functions all operate from the switched digital supply.
LCD outputs operate from their own dedicated boost converter output rail (V
LCD
).
2.3.2 Analog Supply Voltage
The analog functions on the MAX32600 (such as the ADC, DACs, operational amplifiers, and SPST switches) operate from a separate analog supply voltage rail
which may vary from 2.3V to 3.6V (V
DDA3
). This supply is switched automatically and is provided from either V
DDB
(when USB is present) or V
DD
(when USB
is disconnected/unpowered). Four secondary analog power supplies (V
DD3ADC
, V
DDA3ADC
, V
DDA3DAC
, V
DDA3REF
) are normally derived from V
DDA3
. This topology
enables optional external filtering circuits.
Rev.1.3 April 2015 Maxim Integrated Page 10