参数资料
型号: UPD70F3261YGF-JBT-A
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 32 MHz, MICROCONTROLLER, PQFP100
封装: 14 X 20 MM, PLASTIC, QFP-100
文件页数: 85/129页
文件大小: 8549K
代理商: UPD70F3261YGF-JBT-A
CHAPTER 3 CPU FUNCTION
User’s Manual U16541EJ5V1UD
59
(1) Interrupt status saving registers (EIPC and EIPSW)
EIPC and EIPSW are used to save the status when an interrupt occurs.
If a software exception or a maskable interrupt occurs, the contents of the program counter (PC) are saved to
EIPC, and the contents of the program status word (PSW) are saved to EIPSW (these contents are saved to
the NMI status saving registers (FEPC and FEPSW) if a non-maskable interrupt occurs).
The address of the instruction next to the instruction under execution, except some instructions (see 22.8
Periods in Which Interrupts Are Not Acknowledged by CPU), is saved to EIPC when a software exception
or a maskable interrupt occurs.
The current contents of the PSW are saved to EIPSW.
Because only one set of interrupt status saving registers is available, the contents of these registers must be
saved by program when multiple interrupts are enabled.
Bits 31 to 26 of EIPC and bits 31 to 8 of EIPSW are reserved for future function expansion (these bits are
always fixed to 0).
The value of EIPC is restored to the PC and the value of EIPSW to the PSW by the RETI instruction.
31
0
EIPC
(Contents of saved PC)
0
Default value
0xxxxxxxH
(x: Undefined)
26 25
0 0 0 0
31
0
EIPSW
(Contents of
saved PSW)
0
Default value
000000xxH
(x: Undefined)
87
0 0 0 0
0
0 0 0 0
0
0 0 0 0
0
0 0 0 0
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