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參數(shù)資料
| 型號(hào)： | UPD70741GC-25-8EU |
| 廠商： | NEC Corp. |
| 元件分類： | 16位微控制器 |
| 英文描述： | V821TM 32-/16-BIT MICROPROCESSOR |
| 中文描述： | V821TM 32-/16-BIT微處理器 |
| 文件頁(yè)數(shù)： | 18/112頁(yè) |
| 文件大小： | 605K |
| 代理商： | UPD70741GC-25-8EU |
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PD70741
18
3.3.1 Program register set
The program register set includes general-purpose registers and a program counter.
(1) General-purpose registers
The V821 has 32 general-purpose registers, r0-r31. These registers can be used for data or address variables.
Registers r0 and r26-r30 are used implicitly with instructions. Caution is therefore necessary when using these
registers. Registers r1-r5 and r31 are used implicitly by the assembler and the C compiler. Before using these
registers, therefore, the contents of the registers must be saved to prevent their being destroyed. After using
the registers, their contents must be restored.
Table 3-1. Program Registers
Name
Use
Explanation
r0
Zero register
Always stores zeros.
r1
Assembler-reserved register
Used as a working register to create 32-bit immediate.
r2
Handler stack pointer
Used as a stack pointer for the handler.
r3
Stack pointer
Used to create a stack frame at a function call.
r4
Global pointer
Used to access a global variable in a data area.
r5
Text pointer
Points to the top of a text area
r6-r25
-
Register for an address/data variable
r26
String destination start bit offset
Used to execute a bit string instruction.
r27
String source start bit offset
r28
String length register
r29
String destination start address register
r30
String start address register
r31
Link pointer
Stores a return point address according to the execution of a JAL instruction.
(2) Program counter
Stores the address of an instruction while a program is running. Bit 0 of the program counter (PC) is fixed to
0, thus preventing a branch to an odd address. It is initialized to FFFFFFF0H at reset.
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| UPD70F3003A | V853TM 32-/16-BIT SINGLE-CHIP MICROCONTROLLER |
| UPD70F3003AGC-25-8EU | Circular Connector; No. of Contacts:24; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:25-24 RoHS Compliant: No |
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| UPD70F3003AGC-33-8EU | LJT 29C 29#16 PIN PLUG |
| UPD70F3025AGC-33-8EU | LJT 29C 29#16 PIN PLUG |
相關(guān)代理商/技術(shù)參數(shù) |
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| UPD70F3003AGC(A)-33-8EU-A | 制造商:Renesas Electronics Corporation 功能描述: |
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