參數(shù)資料
型號： QADCRM
英文描述： Queued Analog-to-Digital Converter Reference Manual
中文描述： 排隊(duì)模擬到數(shù)字轉(zhuǎn)換器參考手冊
文件頁數(shù)： 47/122頁
文件大?。?/td> 940K
代理商： QADCRM
QADC
REFERENCE MANUAL
DIGITAL CONTROL
MOTOROLA
7-1
SECTION 7 DIGITAL CONTROL
The digital control subsystem includes the control logic to sequence the conversion
activity, channel select logic, the clock and periodic/interval timer, control and status
registers, the conversion command word table RAM, and the result word table RAM.
The central element for control of the QADC conversions is the 40-entry conversion
command word (CCW) table. Each CCW specifies the conversion of one input chan-
nel. Depending on the application, one or two queues can be established in the CCW
table. A queue is a scan sequence of one or more input channels. By using a pause
mechanism, subqueues can be created in the two queues. Each queue can be oper-
ated using several different scan modes. The scan modes for queue 1 and queue 2
are programmed in QACR1 and QACR2 (control registers 1 and 2). Once a queue has
been started by a trigger event (any of the ways to cause the QADC to begin executing
the CCWs in a queue or subqueue), the QADC performs a sequence of conversions
and places the results in the result word table.
7.1 Queue Priority
Queue 1 has priority over queue 2 execution. The following cases show the conditions
under which queue 1 asserts its priority:
When a queue is not active, a trigger event for queue 1 or queue 2 causes the
corresponding queue execution to begin.
When queue 1 is active and a trigger event occurs for queue 2, queue 2 cannot
begin execution until queue 1 reaches completion or the paused state. The status
register records the trigger event by reporting the queue 2 status as trigger pend-
ing. Additional trigger events for queue 2, which occur before execution can be-
gin, are recorded as trigger overruns.
When queue 2 is active and a trigger event occurs for queue 1, the current queue
2 conversion is aborted. The status register reports the queue 2 status as sus-
pended. Any trigger events occurring for queue 2 while queue 2 is suspended are
recorded as trigger overruns. Once queue 1 reaches the completion or the
paused state, queue 2 begins executing again. The programming of the resume
bit in QACR2 determines which CCW is executed in queue 2. Refer to
7.6.3 Con-
trol Register 2
for more information.
When simultaneous trigger events occur for queue 1 and queue 2, queue 1 be-
gins execution and the queue 2 status is changed to trigger pending.
Subqueues that are paused.
The pause feature can be used to divide queue 1 and/or queue 2 into multiple sub-
queues. A subqueue is defined by setting the pause bit in the last CCW of the sub-
queue.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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