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| 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)： | 81/122頁 |
| 文件大?。?/td> | 940K |
| 代理商： | QADCRM |
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QADC
REFERENCE MANUAL
INTERRUPTS
MOTOROLA
8-1
SECTION 8 INTERRUPTS
Interrupt recognition and servicing involve interaction between the integration module,
the CPU, and the module requesting interrupt service. This section provides an over-
view of the QADC interrupt process. Polled operation, an alternative to using inter-
rupts, is discussed along with the different aspects of interrupt operation.
An interrupt is a special form of exception processing. Interrupt requests can be gen-
erated on-chip, or can come from external sources. However, the CPU services all in-
terrupt requests as though originated by an on-chip module — to the CPU, an external
interrupt request appears to come from the integration module. There are schemes to
prioritize all interrupt requests and to arbitrate between simultaneous requests of the
same priority.
8.1 Interrupt Operation
Figure 8-1
displays the QADC interrupt flow.
Figure 8-1 QADC Interrupt Flow Diagram
8.2 Polled and Interrupt-Driven Operation
QADC inputs can be monitored by polling or by using interrupts. When interrupts are
not needed, software can disable the pause and completion interrupts, and monitor
the completion flag and the pause flag for each queue in the status register (QASR).
In other words, flag bits can be polled to determine when new results are available.
Table 8-1
displays the status flag and interrupt enable bits which correspond to queue
1 and queue 2 activity.
QADC INTERRUPT BLOCK
PIE1
PF1
CIE1
CF1
CONVERSION PAUSE ENABLE
CONVERSION PAUSE FLAG
CONVERSION COMPLETE INTERRUPT ENABLE
CONVERSION COMPLETE FLAG
QUEUE 1
(IRL1)
PIE2
PF2
CIE2
CF2
CONVERSION PAUSE ENABLE
CONVERSION PAUSE FLAG
CONVERSION COMPLETE INTERRUPT ENABLE
CONVERSION COMPLETE FLAG
QUEUE 2
(IRL2)
INTERRUPT
ARBITRATION
(IARB)
IRQ[7:0]
INTERRUPT
ACKNOWLEDGE
(IACK)
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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