參數(shù)資料
        型號: ZPSD511B1-70U
        英文描述: Field-Programmable Peripheral
        中文描述: 現(xiàn)場可編程外圍
        文件頁數(shù): 90/153頁
        文件大小: 1036K
        代理商: ZPSD511B1-70U
        PSD5XX Famly
        87
        9.6.2.3 Configuring the Mode of Operation of the Counter/Timers:
        Using the GLOBAL MODE bit of the Global Command register and MODE SELECT bit of
        the Command register of Counter/Timers 0–3, individual Counter/Timer modes of operation
        can be set up. Refer to Table 24. Notice that all the Counter/Timers can either operate in
        Waveform/Pulse or Event Count/Time Capture modes, but not in all four modes at the same
        time.
        Counter/Timer
        Registers
        (Cont.)
        Mode Select Bit
        (Command
        Registers of
        Counter/Timers
        0 – 3 CMD0, CMD1,
        CMD2 and CMD3)
        Gobal Mode Bit
        (Gobal Command
        Register)
        Modes
        of
        Modes
        of
        Counter/Timers
        0, 1 and 3
        Counter/Timer2
        0
        0
        Waveform
        Waveform or
        WatchDog
        0
        1
        Pulse
        Pulse or
        WatchDog
        1
        0
        Event Counter
        WatchDog Only
        1
        1
        Time Capture
        WatchDog Only
        9.6.2.4 Freeze Command Register
        When a Microcontroller needs to access the contents of the Image Registers (IMG0-IMG3)
        it does so by first setting the Command Register Freeze bit in order to disable the timer
        state-machine accesses of the Image Register. The Microcontroller waits for the Freeze
        Acknowledge bit in the Counter/Timer Status Register to be set to 1 and then it accesses
        the Image Register as an address location. The freeze acknowledge signal effectively guar-
        antees stable Image Register data during Microcontroller read/write cycles even though the
        Counter/Timer continues to count. The Freeze Acknowledge bit gets cleared after the
        negation of Freeze. The Freeze Command bits are set and cleared by the microcontroller
        software.
        The Freeze Command Register and the software Load/Store Register should not be set at
        the same time. It is recommended that the registers be accessed individually.
        Bit 7
        Bit 6
        Bit 5
        Bit 4
        Bit 3
        Bit 2
        Bit 1
        Bit 0
        *
        *
        *
        *
        Freeze
        CTU3
        Freeze
        CTU2
        Freeze
        CTU1
        Freeze
        CTU0
        NOTE:
        *
        = Not used.
        Table 24. Counter/Timer Modes
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