參數(shù)資料
型號(hào): ST20GP1
英文描述: MAX 7000 CPLD 256 MC 208-PQFP
中文描述: GPS處理器
文件頁(yè)數(shù): 35/116頁(yè)
文件大小: 1107K
代理商: ST20GP1
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ST20-GP1
35/116
6.2
Instruction characteristics
The Primary Instructions Table 6.3 gives the basic function code. Where the operand is less than
16, a single byte encodes the complete instruction. If the operand is greater than 15, one prefix
instruction (pfix) is required for each additional four bits of the operand. If the operand is negative
the first prefix instruction will be nfix Examples of pfixand nfixcoding are given in Table 6.1.
Any instruction which is not in the instruction set tables is an invalid instruction and is flagged
illegal, returning an error code to the trap handler, if loaded and enabled.
The
Notes
column of the tables indicates the descheduling and error features of an instruction as
described in Table 6.2
.
Mnemonic
Function code
Memory code
ldc
#3
#4
#43
ldc
#35
is coded as
pfix
#3
#2
#23
ldc
#5
#4
#45
ldc
#987
is coded as
pfix
#9
#2
#29
pfix
#8
#2
#28
ldc
#7
#4
#47
ldc
-31 ( ldc #FFFFFFE1)
is coded as
nfix
#1
#6
#61
ldc
#1
#4
#41
Table 6.1 Prefix coding
Ident
Feature
E
Instruction can set an IntegerError trap
L
Instruction can cause a LoadTraptrap
S
Instruction can cause a StoreTraptrap
O
Instruction can cause an Overflow trap
I
Interruptible instruction
A
Instruction can be aborted and later restarted.
D
Instruction can deschedule
T
Instruction can timeslice
Table 6.2 Instruction features
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