ZAMC4100 datasheet(40/156 Pages) RENESAS

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ZAMC4100 Datasheet

January 26, 2016

3.3.2.

WDT during SLEEP and STANDBY Mode

By default the WDT is disabled when the SLEEP or STANDBY Mode is activated. Since it uses a dedicated clock,

if needed, the WDT can continue running when the system is in SLEEP or STANDBY Mode. This feature is

enabled by setting bit WDTPMEN = 1 in register SMDCTRL (see Table 3.5).

If the WDT is running during the SLEEP Mode, then the system reset time-out (if enabled by SWDPOS

configuration in the WDTCONF register) generates a wake-up from sleep instead of a system reset. Refer to

section 3.5.4 for more information regarding wake-up sources.

If the WDT is running during STANDBY Mode, the “MCU reset time-out” generates a wake-up from standby

instead of an MCU reset. Refer to section 3.5.4 for more information regarding wake-up sources.

Note: If the WDT configuration register is locked, the time-out intervals cannot be modified before SLEEP or

STANDBY Mode entry.

3.3.3.

WDT Configuration Register

The WDT configuration register bits mapping and description are given in Table 3.3 and Table 3.4 respectively.

After POR, the WDT is enabled with a 160ms MCU time-out reset and no system reset generation.

Table 3.3

WDTCONF Register Bits Mapping

Name

WDTCONF

Bit No

Bit name

Reset

Access

R/W

Address

0x04

R/W = Read/Write

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