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參數(shù)資料
| 型號： | UPD17149 |
| 廠商： | NEC Corp. |
| 英文描述： | SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 小，通用4位單晶片微控制器 |
| 文件頁數(shù)： | 18/102頁 |
| 文件大?。?/td> | 408K |
| 代理商： | UPD17149 |
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18
μ
PD17145(A1), 17147(A1), 17149(A1)
3. PROGRAM COUNTER (PC)
The program counter is used to address the program memory.
3.1 Configuration of Program Counter
The program counter is a 10-/11-/12-bit binary counter as shown in Figure 3-1.
Figure 3-1. Program Counter
3.2 Operation of Program Counter
Usually, the contents of the program counter are automatically incremented each time an instruction has been
executed. When reset has been effected, when a branch, subroutine call, return, or table reference instruction
has been executed, or when an interrupt has been acknowledged, the address of the program memory to be
executed next is set to the program counter.
Figure 3-2. Value of Program Counter after Instruction Execution
Bit of Program Counter
Value of Program Counter
Instruction
PC11 PC10
PC9
PC8
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
At reset
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Value specified by addr
CALL addr
0
BR @AR
CALL @AR
Contents of address register (AR)
(MOVT DBF, @AR)
RET
RETSK
Contents of address stack indicated by stack pointer (return address)
RETI
When interrupt is acknowledged
Vector address of each interrupt
Remark
The
μ
PD17145(A1) does not have PC11 and PC10. The
μ
PD17147(A1) does not have PC11.
BR addr
MSB
PC11
PC10
PC9
PC8
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
PC ( PD17145(A1))
PC ( PD17147(A1))
PC ( PD17149(A1))
LSB
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UPD17149CT | SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD17147GT | SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD17147GTA1 | SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD17149GTA1 | SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD17201A | 4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND A/D CONVERTER FOR INFRARED REMOTE CONTROL TRANSMITTERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD17149CT | 制造商:NEC 制造商全稱:NEC 功能描述:SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD17149CTA1 | 制造商:NEC 制造商全稱:NEC 功能描述:SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD17149GT | 制造商:NEC 制造商全稱:NEC 功能描述:SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD17149GTA1 | 制造商:NEC 制造商全稱:NEC 功能描述:SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD1714G | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
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