SPC564A80B4 datasheet(27/157 Pages) STMICROELECTRONICS

27 / 157 page

SPC564A74L7, SPC564A80B4, SPC564A80L7

Introduction

Doc ID 15399 Rev 9

27/157

and four independent timer comparators. These comparators produce a CPU interrupt when

the timer exceeds the programmed value.

The following features are implemented in the STM:

●

One 32-bit up counter with 8-bit prescaler

●

Four 32-bit compare channels

●

Independent interrupt source for each channel

●

Counter can be stopped in debug mode

1.5.19

Software watchdog timer (SWT)

The Software Watchdog Timer (SWT) is a second watchdog module to complement the

standard Power Architecture watchdog integrated in the CPU core. The SWT is a 32-bit

modulus counter, clocked by the system clock or the crystal clock, that can provide a system

reset or interrupt request when the correct software key is not written within the required

time window.

The following features are implemented:

●

32-bit modulus counter

●

Clocked by system clock or crystal clock

●

Optional programmable watchdog window mode

●

Can optionally cause system reset or interrupt request on timeout

●

Reset by writing a software key to memory mapped register

●

Enabled out of reset

●

Configuration is protected by a software key or a write-once register

1.5.20

Cyclic redundancy check (CRC) module

The CRC computing unit is dedicated to the computation of CRC off-loading the CPU. The

CRC features:

●

Support for CRC-16-CCITT (x25 protocol):

–X16 + X12 + X5 + 1

●

Support for CRC-32 (Ethernet protocol):

–X32 + X26 + X23 + X22 + X16 + X12 + X11 + X10 + X8 + X7 + X5 + X4 + X2 + X + 1

●

Zero wait states for each write/read operations to the CRC_CFG and CRC_INP

registers at the maximum frequency

1.5.21

Error correction status module (ECSM)

The ECSM provides a myriad of miscellaneous control functions regarding program-visible

information about the platform configuration and revision levels, a reset status register, a

software watchdog timer, wakeup control for exiting sleep modes, and information on

platform memory errors reported by error-correcting codes and/or generic access error

information for certain processor cores.

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