参数资料
型号: ST92186B3BK
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PDIP32
封装: PLASTIC, SDIP-32
文件页数: 114/148页
文件大小: 1664K
代理商: ST92186B3BK
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ST92186B - ON-CHIP PERIPHERALS
7 ON-CHIP PERIPHERALS
7.1 TIMER/WATCHDOG (WDT)
7.1.1 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 39. Timer/Watchdog Block Diagram
INT0
WDTPR
8-BIT PRESCALER
WDTRH, WDTRL
16-BIT
INTCLK/4
INTERRUPT
CONTROL LOGIC
END OF
COUNT
RESET
TOP LEVEL INTERRUPT REQUEST
IAOS
TLIS
INTA0 REQUEST
NMI
WDGEN
DOWNCOUNTER
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