参数资料
型号: M308A3SGP
元件分类: 微控制器/微处理器
英文描述: MROM, 32 MHz, MICROCONTROLLER, PQFP100
封装: 14 X 14 MM, 0.50 MM PITCH, PLASTIC, LQFP-100
文件页数: 15/70页
文件大小: 1203K
代理商: M308A3SGP
M32C/8A Group
2. Central Processing Unit (CPU)
REJ03B0213-0111 Rev.1.11 Mar 31, 2009
Page 20 of 66
2.1.8.7
Interrupt Enable Flag (I)
The I flag enables maskable interrupts.
Interrupts are disabled when the I flag is set to 0 and enabled when it is set to 1. The I flag becomes 0 when
an interrupt request is acknowledged.
2.1.8.8
Stack Pointer Select Flag (U)
ISP is selected when the U flag is set to 0. USP is selected when the U flag is set to 1.
The U flag becomes 0 when a hardware interrupt request is acknowledged or the INT instruction specifying
software interrupt numbers 0 to 31 is executed.
2.1.8.9
Processor Interrupt Priority Level (IPL)
IPL is 3 bits wide and assigns processor interrupt priority levels from level 0 to level 7.
If a requested interrupt has higher priority level than IPL, the interrupt is enabled.
2.1.8.10 Reserved Space
Only write 0 to bits assigned to the reserved space. When read, the bits return undefined values.
2.2
High-Speed Interrupt Registers
Registers associated with the high-speed interrupt are as follows:
Flag save register (SVF)
PC save register (SVP)
Vector register (VCT)
2.3
DMAC-Associated Registers
Registers associated with the DMAC are as follows:
DMA mode register (DMD0, DMD1)
DMA transfer count register (DCT0, DCT1)
DMA transfer count reload register (DRC0, DRC1)
DMA memory address register (DMA0, DMA1)
DMA memory address reload register (DRA0, DRA1)
DMA SFR address register (DSA0, DSA1)
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