參數(shù)資料
型號： 5962R0722402VYC
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： SPECIALTY MICROPROCESSOR CIRCUIT, PQFP256
封裝： QFP-256
文件頁數(shù)： 70/155頁
文件大?。?/td> 4139K
代理商： 5962R0722402VYC
AT697F PRELIMINARY INFORMATION
21
7703D–AERO–12/09
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Traps and
Interrupts
Overview
The AT697F supports two types of traps:
- synchronous traps
- asynchronous traps also called interrupts.
Synchronous traps are caused by hardware responding to a particular instruction. They occur
during the instruction that caused them. Asynchronous traps occur when an external event inter-
rupts the processor. They are not related to any particular instruction and occur between the
execution of instructions.
A trap is a vectored transfer of control to the supervisor through a special trap table that contains
the first four instructions of each trap handler. The trap base address (TBR) of the table is estab-
lished by supervisor and the displacement, within the table, is determined by the trap type.
A trap causes the current window pointer to advance to the next register window and the hard-
ware to write the program counters (PC & nPC) into two registers of the new window.
Synchronous
Traps
The AT697F follows the general SPARC trap model. The table below shows the implemented
traps and their individual priority.
Table 8. Trap Overview
Trap
TT (trap type)
Priority
Description
reset
0x00
1
Power-on reset
write error
0x2b
2
Write buffer error
instruction_access_exception
0x01
3
Error during instruction fetch
Edac uncorrectable error during instruction fetch
illegal_instruction
0x02
5
UNIMP or other un-implemented instruction
privileged_instruction
0x03
4
Execution of privileged instruction in user mode
fp_disabled
0x04
6
FP instruction while FPU disabled
cp_disabled
0x24
6
co-processor instruction while co-processor disabled
watchpoint_detected
0x0B
7
Instruction or data watchpoint match
window_overflow
0x05
8
SAVE into invalid window
window_underflow
0x06
8
RESTORE into invalid window
register_hadrware_error
0x20
9
register file uncorrectable EDAC error
mem_address_not_aligned
0x07
10
Memory access to un-aligned address
fp_exception
0x08
11
FPU exception
data_access_exception
0x09
13
Access error during load or store instruction
tag overflow
0x0A
14
Tagged arithmetic overflow
divide_exception
0x2A
15
Divide by zero
trap_instruction
0x80 -0xFF
16
Software trap instruction (TA)
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