71m6545h-igtr/f Maxim Integrated Products, Inc., 71m6545h-igtr/f Datasheet - Page 43

• Manufacturer Part Number: 71m6545h-igtr/f
• Description: Metrology Processors
• Manufacturer: Maxim Integrated Products, Inc.

PDS_6545_009
Interrupt Priority Level Structure
All interrupt sources are combined in groups, as shown in
Each group of interrupt sources can be programmed individually to one of four priority levels (as shown in
Table 33)
IP1(SFR 0xB9)
polling sequence as shown in
v1.0
Changing interrupt priorities while interrupts are enabled can easily cause software defects. It is best
to set the interrupt priority registers only once during initialization before interrupts are enabled.
Group
EX_WPULSE
EX_XPULSE
EX_VPULSE
EX_YPULSE
by setting or clearing one bit in the SFR interrupt priority register IP0 (SFR 0xA9) and one in
EX_RTC1M
EX_RTC1S
EX_XFER
EX_RTCT
EX_EEX
The proper way to clear the flag bits is to write a byte mask consisting of all ones except for a
zero in the location of the bit to be cleared. The flag bits are configured in hardware to ignore
ones written to them.
0
1
2
3
4
5
EX_SPI
Name
EX0
EX1
EX2
EX3
EX4
EX5
EX6
Interrupt Enable
(Table
External interrupt 0
Timer 0 interrupt
External interrupt 1
Timer 1 interrupt
Serial channel 0 interrupt
34). If requests of the same priority level are received simultaneously, an internal
SFR A8[[0]
SFR A8[2]
SFR B8[1]
SFR B8[2]
SFR B8[3]
SFR B8[4]
SFR B8[5]
Location
2700[0]
2700[1]
2700[2]
2700[4]
2701[7]
2700[7]
2700[6]
2700[5]
2701[6]
2701[5]
© 2008–2011 Teridian Semiconductor Corporation
Table 35
Table 32: Interrupt Priority Level Groups
Table 31: Interrupt Enable and Flag Bits
–
IE_WPULSE
IE_XPULSE
IE_YPULSE
IE_VPULSE
IE_RTC1M
IE_RTC1S
determines which request is serviced first.
IE_XFER
IE_RTCT
IE_EEX
IE_SPI
Name
IEX2
IEX3
IEX4
IEX5
IEX6
IE0
IE1
Interrupt Flag
Serial channel 1 interrupt
Group Members
SFR C0[1]
SFR C0[2]
SFR C0[3]
SFR C0[4]
SFR C0[5]
SFR E8[0]
SFR E8[1]
SFR E8[2]
SFR E8[4]
SFR F8[7]
SFR E8[7]
SFR E8[6]
SFR E8[5]
SFR F8[4]
SFR F8[3]
SFR 88[1]
SFR 88[3]
Location
Table
–
–
–
–
–
32.
External interrupt 0
External interrupt 1
External interrupt 2
External interrupt 3
External interrupt 4
External interrupt 5
External interrupt 6
XFER_BUSY interrupt (int 6)
RTC_1SEC interrupt (int 6)
RTC_1MIN interrupt (int 6)
RTC_T interrupt (int 6)
SPI interrupt
EEPROM interrupt
CE_Xpulse interrupt (int 2)
CE_Ypulse interrupt (int 2)
CE_Wpulse interrupt (int 2)
CE_Vpulse interrupt (int 2)
Interrupt Description
External interrupt 2
External interrupt 3
External interrupt 4
External interrupt 5
External interrupt 6
Data Sheet 71M6545/H
–
43