ST92F150-EVAL STMicroelectronics, ST92F150-EVAL Datasheet - Page 157
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ST92F150-EVAL
Manufacturer Part Number
ST92F150-EVAL
Description
BOARD EVALUATION FOR ST9 SERIES
Manufacturer
STMicroelectronics
Specifications of ST92F150-EVAL
Processor To Be Evaluated
ST90158 and ST92F1x Daughter Board
Interface Type
I2C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
497-2905
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10 ON-CHIP PERIPHERALS
10.1 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.
10.1.1 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-
Figure 87. Timer/Watchdog Block Diagram
tegrity
HW0SW1
WDIN
NMI
INT0
CLOCK CONTROL LOGIC
INEN INMD1 INMD2
WDGEN
INPUT
&
INTCLK/4
MUX
TLIS
IAOS
MUX
CONTROL LOGIC
INTERRUPT
WDT
CLOCK
8-BIT PRESCALER
The main WDT registers are:
– Control register for the input, output and interrupt
– 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-
logic blocks (WDTCR)
ble.
WDTPR
OUTMD
OUTPUT CONTROL LOGIC
TOP LEVEL INTERRUPT REQUEST
RESET
INTA0 REQUEST
WROUT
DOWNCOUNTER
WDTRH, WDTRL
TIMER/WATCHDOG (WDT)
16-BIT
OUTEN
COUNT
END OF
WDOUT
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