DS80CH11 Datasheet, PDF (22/88 Pages) Dallas Semiconductor – System Energy Manager

DS80CH11
3.6 INTERRUPT CONTROL
The SEM provides 16 sources of interrupt with three
priority levels. The Power–fail Interrupt (PFI), if
enabled, always has the highest priority. There are two
remaining user selectable priorities: high and low. If two
interrupts that have the same priority occur simulta-
neously, the hardware–determined precedence given
below determines which is a acted upon. Except for the
PFI, all interrupts that are new to the 8051 family have a
lower natural priority than the originals.
INTERRUPT PRIORITY Table 3–2
NAME
PFI
INT0
TF0
INT1
TF1
SCON0
TF2
AMI
2WI1
ADI
2WI2
KBI
PBI1
KDI
WDI
PBI2
DESCRIPTION
Power Fail Interrupt
External Interrupt 0
Timer 0
External Interrupt 1
Timer 1
TI0 or RI0 from Serial Port 0
Timer 2
Activity Monitor Interrupt
2–Wire Serial Port 1
A/D End of Conversion
2–Wire Serial Port 2
Keyboard Buffer Input
Power Mgmt. Buffer Input #1
Key Detect Input
WatchDog Periodic Interrupt
Power Mgmt. Buffer Input #2
VECTOR
33h
03h
0Bh
13h
1Bh
23h
2Bh
3Bh
43h
4Bh
53h
5Bh
63h
6Bh
73h
7Bh
NATURAL
PRIORITY
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
8051/DALLAS
DALLAS
8051
8051
8051
8051
8051
8051
DALLAS
DALLAS
DALLAS
DALLAS
DALLAS
DALLAS
DALLAS
DALLAS
DALLAS
INTERRUPT CONTROL SUMMARY Table 3–3
INTERRUPT
SOURCE
FLAG(S)
FLAG
LOC.
ENABLE
Power Fail
PFI
WDCON.4 EPFI
External 0
IE0
TCON.1
EX0
Timer 0
TF0
TCON.5
ET0
External 1
IE1
TCON.3
EX1
Timer 1
TF1
TCON.7
ET1
Serial Port 0
RI0,TI0
SCON0.0/
ES0
SCON0.1
Timer 2
TF2
T2CON.7
ET2
Activity monitor
AMF7–0
AMF.7–0
EAM
ENABLE
LOC.
WDCON.5
IE.0
IE.1
IE.2
IE.3
IE.4
PRIORITY
N/A
PX0
PT0
PX1
PT1
PS0
IE.5
PT2
IE.6
PAM
PRIORITY
LOC.
N/A
IP.0
IP.1
IP.2
IP.3
IP.4
IP.5
IP.6
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