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參數(shù)資料
| 型號(hào)： | M32000D3FP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 66.6 MHz, RISC MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-100 |
| 文件頁(yè)數(shù)： | 100/155頁(yè) |
| 文件大?。?/td> | 1340K |
| 代理商： | M32000D3FP |
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M32000D3FP User's Manual
EIT
4-13
4.8 Exception processing
4.8.2 Address exception (AE)
[Occurrence condition]
The AE occurs if an attempt is made to access an unaligned address with either a load instruction
or store instruction. Instructions and address combinations which cause the address exception are
as follows:
when executing the LDH, LDUH and STH instructions and the lowest 2 bits of the address are
"01" or "11".
when executing the LD, ST, LOCK and UNLOCK instructions and the lowest 2 bits of the
address are "01", "10" or "11".
When AE occurs, memory access by the initiating instruction is not carried out and the AE is
accepted even if an external interrupt has been requested.
[EIT processing]
(1) SM, IE and C bits saving
The SM, IE and C bits are saved in the PSW register.
BSM
← SM
BIE
← IE
BC
← C
(2) SM, IE and C bits updating
The SM, IE and C bits in the PSW register are updated.
SM
← not changed
IE
← 0
C
← 0
(3) PC saving
The PC value of the instruction that caused the AE is set in the BPC. For example, if the instruction
which caused the AE is in address 4, "4" is set in the BPC. If it is address 6, then "6" is set. In
this case, the value of bit 30 in the BPC indicates whether the instruction that caused the AE is
on the word boundary (BPC[30] = 0) or not (BPC[30] = 1).
In both of the above cases, however, the return address of the RTE instruction after EIT handler
processing becomes address 4 because the lowest 2 bits are cleared to "00" when returning the
BPC value to the PC.
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