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AS8218 датащи(PDF) 84 Page - ams AG

номер детали AS8218
подробное описание детали  Highly Integrated Single Phase 2 Current Energy Metering Integrated Circuits
PDF  123 Pages
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производитель  AMSCO [ams AG]
домашняя страница  http://www.ams.com
Logo AMSCO - ams AG

AS8218 датащи(HTML) 84 Page - ams AG

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Data Sheet AS8218 / AS8228
Revision 3.0, 31-May-06
Page 84 of 123
Interrupt Priorities
Each interrupt source can be individually assigned one of two priority levels. A low priority interrupt can always
be interrupted by a higher-priority interrupt, but not by another low priority interrupt. A high-priority interrupt
cannot be interrupted by any other interrupt source.
If the corresponding IP bit is set then this interrupt is serviced first if another interrupt request occurs at the
same time where the IP bit is zero.
Interrupt on the same priority level are serviced due to the internal polling sequence starting with DSP highest
down to RTC lowest.
Symbol
Position
Function
Source Flags
IP.7
-
PRTC
IP.6
Real time clock, priority bit
TSA, STF, A1F, A2F
PS2
IP.5
UART2 serial port, priority bit
RI, TI
PS
IP.4
1
UART1 serial port, priority bit
RI, TI
PSPI
IP.3
SPI serial port, priority bit
ITRA
PIOX
IP.2
MPIO external pin, priority bit
in Status 0 / Status 1
PT0
IP.1
1
Timer 0, priority bit
TF0
PDSP
IP.0
DSP priority bit
dai, alarm
Note:
1) Standard 8051 bits
PSPI
IP = 1
IP = 0
High
Priority
Interrupt
Low
Priority
Interrupt
IE Register
IP Register
Priority Level
High
Priority
Level
Low
Polling
Sequence
Global enable
Individual enables
Source
PS
PIOX
PTO
PDSP
PS2
PRTC
Figure 22: Interrupt control system



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