tm1300 NXP Semiconductors, tm1300 Datasheet - Page 357

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

Philips Semiconductors
Hardware 8-bit store with displacement
SYNTAX
FUNCTION
DESCRIPTION
address formed from the sum r src2 + d . The value of the opcode modifier d must be in the range -64 and 63 inclusive.
This operation does not depend on the bytesex bit in the PCSW since only a single byte is stored.
modification of the addressed memory location (and the modification of cache if the location is cacheable). If the LSB
of r guard is 1, the store takes effect. If the LSB of r guard is 0,
LRU and other status bits in the data cache are not affected.
EXAMPLES
r10 = 0xd00, r80 = 0x44332211
r50 = 0, r20 = 0xd01,
r70 = 0xaabbccdd
r60 = 1, r30 = 0xd02,
r70 = 0xaabbccdd
The
The
[ IF r guard ] h_st8d( d ) r src1 r src2
if r guard then
h_st8d
h_st8d
mem[r src2 + d ]
Initial Values
operation stores the least-significant 8-bit byte of r src1 into the memory location pointed to by the
operation optionally takes a guard, specified in r guard . If a guard is present, its LSB controls the
r src1 <7:0>
h_st8d(3) r80 r10
IF r50 h_st8d(-4) r70 r20
IF r60 h_st8d(-4) r70 r30
Operation
PRODUCT SPECIFICATION
h_st8d
has no side effects whatever; in particular, the
[0xd03]
no change, since guard is false
[0xcfe]
DSPCPU Operations for TM1300
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
st8 st8d st16 st16d st32
0xdd
0x11
ATTRIBUTES
SEE ALSO
Result
st32d
h_st8d
–64..63
dmem
7 bits
4, 5
n/a
29
2
A-71