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| 型號(hào)： | ZPSD502B1-15JI |
| 英文描述： | Avalanche Glass Passivated Bridge Rectifiers |
| 中文描述： | 現(xiàn)場(chǎng)可編程外圍 |
| 文件頁(yè)數(shù)： | 78/153頁(yè) |
| 文件大?。?/td> | 1036K |
| 代理商： | ZPSD502B1-15JI |
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PSD5XX Famly
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9.6.1.5 Time Capture Mode
In the time capture mode, the Counter/Timer is capable of measuring the time
(by counting clock pulses) between events. Figure 39 shows the CTU configuration for
time capture. All the Counter/Timer registers must be cleared during initialization of the
Time Capture mode. Here the Counter is enabled to count via software only. The CTUs
continuously count. A Load/Store pulse triggers the storing of the Counter’s contents into
the associated image register. The image register effectively contains a “snap shot” of the
Counter at the time of the pulse. The CTU Store input is edge-triggered by events, the
events being:
J
Pin Driven.
J
PPLD Macrocell Driven.
J
Software Driven.
A Freeze signal is used to ensure that image data is stable during Microcontroller reads
which is similar to the description of event Counter Microcontroller read accesses. Two
CTUs in time capture mode can be used to capture the rising and the falling edges of a
pulse, the difference of the measurements being the pulse width. The counter continues to
count regardless of the Freeze Acknowledge state.
Note that the time span between two consecutive edges of Time Capture must be greater
than one timer clock cycle in order to be captured.
9.6.1.6 WatchDog Counter/Timer
Counter/Timer-2 can be operated as a WatchDog Timer in both Waveform/Pulse and Event
count/time capture modes. In Event count/time capture mode, Counter/Timer-2 can be
configured only as WatchDog. Figure 40 shows the control signals of the CTU when in
WatchDog mode. When the WatchDog mode is active, CTU2 counts down and at the
terminal count of Counter-2 a WatchDog condition occurs. To avoid the WatchDog from
occurring, a "Write" to the Software Load/Store Bit-2 in the "Software Load/Store Register"
has to take place before the Counter-2 underflows. This action reloads the Counter-2 with
the initial count value in the Image Register-2. Note that this initial count value cannot be
changed after the WatchDog mode is enabled.
The Terminal Count signal of a WatchDog could result in a pulse width that is equal to the
count value loaded into the Image Register of Counter/Timer-2. The active high WatchDog
pulse from Counter 2 is routed through the PPLD, enabling the user to inverse its polarity or
implement any other logic before driving the WatchDog output on a user defined I/O pin.
This signal could be used to drive a RESET pin or trigger a Non-Maskable interrupt on a
processor. Once Counter/Timer-2 is set to the WatchDog mode, it cannot be reconfigured
by software and it can get out of the WatchDog mode only by a RESET.
When the WatchDog is enabled in Power Down and Sleep modes, it remains active
regardless of the state of bit 7 (TMR CLK) in Power Management Mode Register PMMR0.
The WatchDog mode is enabled by setting the WatchDog bit in the global command
register. Setting up the command register for CTU2 is not required except when CTU3 is
configured in pulse mode. In this case, bit 0 of the command register for CTU2 is set to “1”.
Counter/Timer
Operation
(Cont.)
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