tm1300 NXP Semiconductors, tm1300 Datasheet - Page 493

• Manufacturer Part Number: tm1300
• Description: Tm-1300 Media Processor
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Write source program counter
SYNTAX
FUNCTION
DESCRIPTION
hardware update (during an interruptible jump) and a software update (through a
update takes precedence.
writes its target address to SPC. The value of SPC is intended to allow an exception-handling routine to determine the
start address of the block of scheduled code (called a decision tree) that was executing before the exception was
taken.
modification of SPC. If the LSB of r guard is 1, SPC is written; otherwise, SPC is unchanged.
EXAMPLES
r30 = 0xbeebee
r20 = 0, r31 = 0xabba
r21 = 1, r31 = 0xabba
The
An interruptible jump that is not interrupted (no NMI, INT, or EXC event was pending when the jump was executed)
The
[ IF r guard ] writespc r src1
if r guard then
SPC
writespc
writespc
Initial Values
r src1
copies the value of r src1 to the SPC (Source Program Counter) processor register. Whenever a
operation optionally takes a guard, specified in r guard . If a guard is present, its LSB controls the
writespc r30
IF r20 writespc r31
IF r21 writespc r31
Operation
PRODUCT SPECIFICATION
SPC
no change, since guard is false
SPC
0xbeebee
0xabba
DSPCPU Operations for TM1300
writespc
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
readspc writedpc ijmpf
Result
ijmpi ijmpt
ATTRIBUTES
SEE ALSO
) coincide, the software
writespc
fcomp
159
No
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1
1
3
A-207