参数资料
型号: M32000D3FP
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 66.6 MHz, RISC MICROCONTROLLER, PQFP100
封装: 14 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-100
文件页数: 98/155页
文件大小: 1340K
代理商: M32000D3FP
M32000D3FP User's Manual
EIT
4-11
4.8 Exception processing
4.8.1 Reserved instruction exception (RIE)
[Occurrence condition]
The RIE occurs when attempted execution of a reserved instruction (unimplemented instruction) is
detected. An instruction check is made on the instruction op code.
When RIE occurs, that instruction is not executed. Also note that, the RIE 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 RIE is set in the BPC. For example, if the
instruction caused the RIE 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 RIE
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 the 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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