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| 型號(hào)： | 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(cè) |
| 文件頁(yè)數(shù)： | 86/122頁(yè) |
| 文件大?。?/td> | 940K |
| 代理商： | QADCRM |
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MOTOROLA
8-6
INTERRUPTS
QADC
REFERENCE MANUAL
8.9 Interrupt Processing Summary
A summary of the entire interrupt processing sequence follows.
1. A result is written for the last CCW in a queue and the completion flag for the
corresponding queue is set, and when enabled, an interrupt request is gener-
ated. Similarly, each time a result is written for a CCW with the pause bit set,
the queue pause flag is set, and when enabled, an interrupt request is generat-
ed.
2. QADC asserts the internal interrupt request line corresponding to the level pro-
grammed in the IRL1 and IRL2 field in the QADCINT.
3. An interrupt acknowledge cycle is performed on the IMB, during which time the
CPU identifies the highest interrupt level requesting service. The CPU com-
pares the level of each interrupt request it receives with the mask value. Inter-
rupt request levels greater than the mask are accepted; interrupt request levels
less than or equal to the mask are ignored.
4. If multiple modules simultaneously assert the same interrupt request level, the
values in the IARB field in the respective module configuration registers deter-
mine which module is serviced first.
5. When the QADC is the only module with an interrupt pending at the level being
acknowledged, or when the QADC IARB value is higher than the modules with
requests pending at the given interrupt level, the QADC responds to the inter-
rupt acknowledge cycle by providing an 8-bit vector number which the CPU
uses to call an interrupt service routine.
6. The CPU calculates displacement into the exception vector table using the vec-
tor number supplied by the QADC, then jumps to the service routine pointed to
by the vector.
7. The subroutine services the interrupt. As part of interrupt servicing, it must clear
the pause or completion flag by writing a zero to the flag bit after reading the
flag.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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