CC2430
8051 CPU : Interrupts
Table 29: Instructions that affect flag settings
Instruction
ADD
CY
OV
AC
x
x
x
0
0
x
x
x
1
x
x
x
x
x
x
x
x
x
x
x
x
-
-
-
-
-
-
-
-
-
-
-
-
-
-
ADDC
x
x
x
x
-
SUBB
MUL
DIV
DA
RRC
-
RLC
-
SETB C
CLR C
CPL C
ANL C,bit
ANL C,/bit
ORL C,bit
ORL C,/bit
MOV C,bit
CJNE
-
-
-
-
-
-
-
-
-
“0”=set to 0, “1”=set to 1, “x”=set to 0/1, “-“=not affected
11.5 Interrupts
The CPU has 18 interrupt sources. Each
source has its own request flag located in a set
of Interrupt Flag SFR registers. Each interrupt
requested by the corresponding flag can be
individually enabled or disabled. The
definitions of the interrupt sources and the
interrupt vectors are given in Table 30.
The interrupts are grouped into a set of priority
level groups with selectable priority levels.
The interrupt enable registers are described in
section 11.5.1 and the interrupt priority settings
are described in section 11.5.3 on page 57.
11.5.1
Interrupt Masking
Each interrupt can be individually enabled or
disabled by the interrupt enable bits in the
Interrupt Enable SFRs IEN0, IEN1and IEN2.
The CPU Interrupt Enable SFRs are described
below and summarized in Table 30.
1. Clear interrupt flags
2. Set individual interrupt enable bit in
the peripherals SFR register, if any.
3. Set the corresponding individual,
interrupt enable bit in the IEN0, IEN1
or IEN2registers to 1.
4. Enable global interrupt by setting the
EA bit in IEN0to 1
5. Begin the interrupt service routine at
the corresponding vector address of
that interrupt. See Table 30 for
addresses
Note that some peripherals have several
events that can generate the interrupt request
associated with that peripheral. This applies to
Port 0, Port 1, Port 2, Timer 1, Timer2, Timer
3, Timer 4 and Radio. These peripherals have
interrupt mask bits for each internal interrupt
source in the corresponding SFR registers.
Figure 10 gives a complete overview of all
interrupt sources and associated control and
state registers. Shaded boxes are interrupt
flags that are automatically cleared by HW
In order to enable any of the interrupts in the
CC2430, the following steps must be taken:
when interrupt service routine is called.
indicates a one-shot, either due to the level
source or due to edge shaping. For the
CC2430 Data Sheet (rev. 2.1) SWRS036F
Page 49 of 211
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