參數(shù)資料
型號(hào): μPD70F3003
廠商: NEC Corp.
英文描述: 16/32 Bit Single Chip Microcontrollers(16/32 位單片微控制器)
中文描述: 16/32位單片機(jī)微控制器(16/32位單片微控制器)
文件頁(yè)數(shù): 19/141頁(yè)
文件大?。?/td> 374K
代理商: ΜPD70F3003
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7
CHAPTER 2 REGISTER SET
Figure 2-2. Program Register Operations
Name
Usage
Operation
r0
Zero register
Always holds 0.
r1
Assembler-reserved register
Used as working register for address generation.
r2
Interrupt stack pointer
Used as stack pointer for interrupt handler.
r3
Stack pointer
Used for stack frame generation when function is
called.
r4
Global pointer
Used to access global variable in data area.
r5
Text pointer
Used as register for pointing start address of text
area
Note
.
r6
through
Address/data variable registers
r29
r30
Element pointer
Used as base pointer for address generation
when memory is accessed.
r31
Link pointer
Used when compiler calls function.
PC
Program counter
Holds instruction address during program execu-
tion.
Note
Text area : Area where program code is placed.
Remark
For detailed descriptions of r1 to r31 used by assembler and C compiler, see the
C compiler
package (CA850)
User’s Manual
.
(2) Program counter
This register holds an instruction address during program execution. The lower 24 bits of this register are valid,
and bits 31 through 24 are reserved fields (fixed to 0). If a carry occurs from bit 23 to 24, it is ignored.
Bit 0 is always fixed to 0, and execution cannot branch to an odd address.
Remark
RFU : Reserved field (Reserved for Future Use)
31
PC
RFU
0
24 23
1
0
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