
Data Sheet
July 2000
DSP16210 Digital Signal Processor
108
DRAFT COPY
Lucent Technologies Inc.
Software Architecture
(continued)
Registers
(continued)
Register Settings
(continued)
Table 68. psw1 (Processor Status Word 1) Register
15
14
IEN
13—12
IPL
C
[1:0]
11—10
IPL
P
[1:0]
9—7
6
5—0
a[7:2]V
Reserved
Reserved
EPAR
Bit
15
14
Field
Reserved
IEN
Value
—
0
1
00
01
10
11
00
01
10
11
—
0
1
1
Description
Reserved—write with zero.
Interrupts are globally disabled
§
.
Interrupts are globally enabled.
Current interrupt priority level is 0; core handles pending interrupts of priority 1, 2, or 3.
Current interrupt priority level is 1; core handles pending interrupts of priority 2 or 3.
Current interrupt priority level is 2; core handles pending interrupts of priority 3 only.
Current interrupt priority level is 3; core does not handle any pending interrupts
§
.
Previous interrupt priority level
was 0.
Previous interrupt priority level
was 1.
Previous interrupt priority level
was 2.
Previous interrupt priority level
was 3.
Reserved—write with zero.
Most recent BMU or special function shift result has odd parity.
Most recent BMU or special function shift result has even parity.
a7V is set if an operation results in mathematical overflow, the result is written to
a7
,
and FSAT=0.
a6V is set if an operation results in mathematical overflow, the result is written to
a6
,
and FSAT=0.
a5V is set if an operation results in mathematical overflow, the result is written to
a5
,
and FSAT=0.
a4V is set if an operation results in mathematical overflow, the result is written to
a4
,
and FSAT=0.
a3V is set if an operation results in mathematical overflow, the result is written to
a3
,
and FSAT=0.
a2V is set if an operation results in mathematical overflow, the result is written to
a2
,
and FSAT=0.
13—12
IPL
C
[1:0]
11—10
IPL
P
[1:0]
9—7
6
Reserved
EPAR
5
a7V
4
a6V
1
3
a5V
1
2
a4V
1
1
a3V
1
0
a2V
1
Cleared on reset.
This bit is read only. The programmer clears this bit by executing a
di
instruction and sets it by executing an
ei
or
ireturn
instruction. If the
core services an interrupt, it clears this bit.
The core handles any pending traps.
Previous interrupt priority level is the priority level of the interrupt most recently serviced prior to the current interrupt. This field is used for
interrupt nesting.
§