参数资料
型号: R5F21258SDXXXFP
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP52
封装: 10 X 10 MM, 0.65 MM PITCH, PLASTIC, LQFP-52
文件页数: 7/59页
文件大小: 528K
代理商: R5F21258SDXXXFP
R8C/24 Group, R8C/25 Group
2. Central Processing Unit (CPU)
Rev.3.00
Feb 29, 2008
Page 15 of 51
REJ03B0117-0300
2.8.7
Interrupt Enable Flag (I)
The I flag enables maskable interrupts.
Interrupt are disabled when the I flag is set to 0, and are enabled when the I flag is set to 1. The I flag is set to 0
when an interrupt request is acknowledged.
2.8.8
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 is set to 0 when a hardware interrupt request is acknowledged or the INT instruction of software
interrupt numbers 0 to 31 is executed.
2.8.9
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 than IPL, the interrupt is enabled.
2.8.10
Reserved Bit
If necessary, set to 0. When read, the content is undefined.
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