W7500P datasheet(10/38 Pages) WIZNET

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3.4 System configuration controller (SYSCFG)

Main purposes of the system configuration controller are the following



The ability to enable an automatic reset if the system locks up



Information about the cause of the last reset

3.5 Power management

3.5.1

Power supply schemes

W7500x embeds a voltage regulator in order to supply the internal 1.5V digital power domain.

Require a 2.7V ~ 3.6V operating supply voltage (VDD).

3.5.2

Low-power modes

W7500x is in RUN mode after a system or power reset. There are two low power modes to save

power when the CPU does not need to be kept running. These modes are useful for instances

like when the CPU is waiting for an external interrupt. Please note that there is no power-off

mode for W7500x.

The device features two low-power modes:



Sleep mode



Deep Sleep mode

Additionally, the power consumption can be reducing by following method:

User can slow down the system clocks

User can gate the clocks to the peripherals when they are unused.

Sleep mode / Deep sleep mode

W7500x has two kinds of sleep modes. One is Sleep mode and the other is Deep sleep mode.

Two of them are almost the same except the clock gated peripherals kinds. Table 3 shows the

Sleep mode summary.

Table 3 W7500x sleep mode summary

Mode

Entry

Wakeup

Effect on clocks

Sleep mode

DEEPSLEEP = 0

Enable WFI

Any interrupt

CPU clock OFF

APB Bus Clock ON

AHB Bus clock ON

Memory clocks ON

DEEPSLEEP = 0

Enable WFE

Wakeup event

Deep Sleep mode

DEEPSLEEP = 1

Enable WFI

Any interrupt

CPU clock OFF

APB Bus Clock OFF

AHB Bus clock OFF

Memory clocks OFF

DEEPSLEEP = 1

Enable WFE

Wakeup event

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