QU80386EXTC25 Intel, QU80386EXTC25 Datasheet - Page 23

• Manufacturer Part Number: QU80386EXTC25
• Description: IC INT PROC 5V 25MHZ 132QFP
• Manufacturer: Intel

Specifications of QU80386EXTC25

• Processor Type: 386EX
• Features: 32-bit, Extended Temp
• Speed: 25MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 132-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 863826

5.0
5.1
Datasheet
Table 5.
Design Considerations
This section describes the Intel386 EX microprocessor’s instruction set and its component and
revision identifiers.
Instruction Set
The Intel386 EX microprocessor uses the same instruction set as the Intel386 SX microprocessor
with the following exceptions.
The Intel386 EX microprocessor has one new instruction (RSM). This Resume instruction causes
the processor to exit System Management Mode (SMM). RSM requires 338 clocks per instruction
(CPI).
The Intel386 EX microprocessor requires more clock cycles than the Intel386 SX microprocessor
to execute some instructions. Table 5 lists these instructions and the Intel386 EX microprocessor
clock count. For the equivalent Intel386 SX microprocessor clock count, refer to the “Instruction
Set Clock Count Summary” table in the Intel386™ SX Microprocessor datasheet (order number
240187).
Microprocessor Clocks Per Instruction
POPA
IN:
OUT:
INS
OUTS
REP INS
REP OUTS
HLT
MOV CR0, reg
NOTES:
Fixed Port
Variable Port
Fixed Port
Variable Port
1. For IN, OUT, INS, OUTS, REP INS, and REP OUTS instructions, add one clock count for each wait state
2. The clock count values in this column apply if I/O permission allows I/O to the port in virtual 8086 mode. If
3. When two clock counts are listed, the smaller value refers to the case where CPL
4. n = the number of times repeated.
Instruction
generated by the peripheral being accessed (the values in the table are for zero wait state).
the I/O bit map denies permission, exception fault 13 occurs; see clock counts for the INT 3 instruction in
the “Instruction Set Clock Count Summary” table in the Intel386™ SX Microprocessor datasheet (order
number 240187).
value refers to the case where CPL>IOPL. CPL is the current privilege level, and IOPL is the I/O privilege
level.
Virtual 8086 Mode
31+6 n
30+8 n
27
28
27
28
30
31
(Note 4)
(Note 4)
(2)
or Virtual 8086 Mode
Real Address Mode
17+7 n
16+8 n
Intel386™ EX Embedded Microprocessor
Clock Count
18
29
14
15
14
15
17
10
7
(Note 4)
(Note 4)
(1)
Protected Virtual Address Mode
11+7 n /32+6 n
10+8 n /31+8 n
IOPL and the larger
10/32
11/33
8/29
9/29
8/29
9/29
35
10
7
(Note 4)
(Note 4)
23
(3)