參數(shù)資料
型號: ZPSD502B1-70UI
英文描述: Avalanche Bridge Rectifiers
中文描述: 現(xiàn)場可編程外圍
文件頁數(shù): 90/153頁
文件大?。?/td> 1036K
代理商: ZPSD502B1-70UI
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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