RM0345 datasheet(11/38 Pages) STMICROELECTRONICS

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RM0345

Reset and configuration signals

Doc ID 024080 Rev 3

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Reset and configuration signals

Calibration and debug tools may use the reset signals included in the

connectors to have

visibility of when the SPC563M64xx device has been reset. Debug tools may also require

the ability to force device reset.

All signals of the SPC563M64xx QFP144 footprint from the application board are directly

connected to the respective calibration device signals. This includes the following signals on

the Table 3.

Table 3.

Reset and configuration signals

Signal name

Function

Notes

Reset / Configuration (5)

/RESET

External reset input

The /RESET pin is an active low input. The

RESET pin is asserted by an external device

during a power-on or external reset. The

internal reset signal asserts only if the RESET

pin asserts for 10 clock cycles. Assertion of

the RESET pin while the device is in reset

causes the reset cycle to start over.

/RSTOUT

External reset output

The RSTOUT pin is an active low output that

uses a push/pull configuration. The RSTOUT

pin is driven to the low state by the MCU for all

internal and external reset sources. There is a

delay between initiation of the reset and the

assertion of the RSTOUT pin.

BOOTCFG[1]

Boot configuration input

The BOOTCFG field holds the value of the

BOOTCFG[1] pin that was latched on the last

negation of the RSTOUT pin. The BOOTCFG

field is used by the BAM program to

determine the location of the Reset

Configuration Word.

PLLREF

FMPLL Mode Selection

PLLREF is used to select whether the

oscillator operates in xtal mode or external

reference mode from reset.

If RSTCFG is 0, External reference clock

selected.

If RSTCFG is 1, Xtal oscillator mode is

selected

WKPCFG

Weak Pull Configuration

The signal on the WKPCFG pin determines

whether weak pull up or pull down devices are

enabled after reset on the eTPU and eMIOS

pins.

0: Weak pulldown applied to eTPU and

eMIOS pins at reset

1: Weak pullup applied to eTPU and eMIOS

pins at reset.

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