ST92T163R4D0 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST92T163R4D0

8/16-BIT FULL SPEED USB MCU FOR COMPOSITE DEVICES WITH 16 ENDPOINTS, 20K ROM, 2K RAM, I2C, SCI, & MFT

STMicroelectronics 

ST92163 - TIMER/WATCHDOG (WDT)

8 ON-CHIP PERIPHERALS

8.1 TIMER/WATCHDOG (WDT)

Important Note: This chapter is a generic descrip-

tion of the WDT peripheral. However depending

on the ST9 device, some or all of WDT interface

signals described may not be connected to exter-

nal pins. For the list of WDT pins present on the

ST9 device, refer to the device pinout description

in the first section of the data sheet.

8.1.1 Introduction

The Timer/Watchdog (WDT) peripheral consists of

a programmable 16-bit timer and an 8-bit prescal-

er. It can be used, for example, to:

– Generate periodic interrupts

– Measure input signal pulse widths

– Request an interrupt after a set number of events

– Generate an output signal waveform

– Act as a Watchdog timer to monitor system in-

tegrity

The main WDT registers are:

– Control register for the input, output and interrupt

logic blocks (WDTCR)

– 16-bit counter register pair (WDTHR, WDTLR)

– Prescaler register (WDTPR)

The hardware interface consists of up to five sig-

nals:

– WDIN External clock input

– WDOUT Square wave or PWM signal output

– INT0 External interrupt input

– NMI Non-Maskable Interrupt input

– HW0SW1 Hardware/Software Watchdog ena-

ble.

Figure 61. Timer/Watchdog Block Diagram

INEN INMD1 INMD2

WDI N1

INPU T

&

CLOCK CONTROL LOGIC

INTCLK /4

MUX

WDT

CLOCK

WDTPR

8-BIT PRESCALER

WDTRH , WDTRL

16-BIT

DOWNCOU NTER

OUTMD WROUT OUTEN

END OF

COUNT

NMI1

INT0 1

HW0SW 11

W DGEN

MUX

IAOS

TLIS

1Pin not present on some ST9 devices.

OUTPUT CONTROL LOGIC

INTERRUPT

CONTROL LOGIC

WDOUT1

RESET

TOP LEVEL INTERRUPT REQUES T

INTA0 REQUEST

104/224

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