PIC17C4X
DS30412C-page 122
1996 Microchip Technology Inc.
DCFSNZ
Decrement f, skip if not 0
Syntax:
[
label] DCFSNZ f,d
Operands:
0
≤ f ≤ 255
d
∈ [0,1]
Operation:
(f) – 1
→ (dest);
skip if not 0
Status Affected:
None
Encoding:
0010
011d
ffff
Description:
The contents of register 'f' are decre-
mented. If 'd' is 0 the result is placed in
WREG. If 'd' is 1 the result is placed
back in register 'f'.
If the result is not 0, the next instruction,
which is already fetched, is discarded,
and an NOP is executed instead mak-
ing it a two-cycle instruction.
Words:
1
Cycles:
1(2)
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register 'f'
Execute
Write to
destination
If skip:
Q1
Q2
Q3
Q4
Forced NOP
NOP
Execute
NOP
Example:
HERE
DCFSNZ
TEMP, 1
ZERO
:
NZERO
:
Before Instruction
TEMP_VALUE
=
?
After Instruction
TEMP_VALUE
=
TEMP_VALUE - 1,
If TEMP_VALUE
=
0;
PC
=
Address (ZERO)
If TEMP_VALUE
0;
PC
=
Address (NZERO)
GOTO
Unconditional Branch
Syntax:
[
label ]
GOTO k
Operands:
0
≤ k ≤ 8191
Operation:
k
→ PC<12:0>;
k<12:8>
→ PCLATH<4:0>,
PC
<15:13> → PCLATH<7:5>
Status Affected:
None
Encoding:
110k
kkkk
Description:
GOTO
allows an unconditional branch
anywhere within an 8K page boundary.
The thirteen bit immediate value is
loaded into PC bits <12:0>. Then the
upper eight bits of PC are loaded into
PCLATH. GOTO is always a two-cycle
instruction.
Words:
1
Cycles:
2
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read literal
'k'<7:0>
Execute
NOP
Forced NOP
NOP
Execute
NOP
Example:
GOTO THERE
After Instruction
PC =
Address (THERE)
相关PDF资料
DSPIC30F2023-30I/ML IC DSPIC MCU/DSP 12K 44QFN
PIC16LF767-I/ML IC PIC MCU FLASH 8KX14 28QFN
PIC18LF2320-I/SO IC MCU FLASH 4KX16 EEPROM 28SOIC
PIC18F4458-I/ML IC PIC MCU FLASH 12KX16 44QFN
DSPIC33FJ64GP706A-I/PT IC DSPIC MCU/DSP 64K 64-TQFP
PIC16F874-20/P IC MCU FLASH 4KX14 EE 40DIP
DSPIC33FJ64GP706-I/PT IC DSPIC MCU/DSP 64K 64TQFP
PIC24HJ128GP210-I/PT IC PIC MCU FLASH 128KB 100TQFP
相关代理商/技术参数
PIC18F4525-I/P 功能描述:8位微控制器 -MCU 48KB 3968 RAM 36I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC18F4525-I/P 制造商:Microchip Technology Inc 功能描述:IC 8BIT FLASH MCU 18F4525 DIP40
PIC18F4525-I/PT 功能描述:8位微控制器 -MCU 48KB 3968 RAM 36I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC18F4525-I/PT 制造商:Microchip Technology Inc 功能描述:IC 8BIT FLASH MCU 18F4525 TQFP44
PIC18F4525T-I/ML 功能描述:8位微控制器 -MCU 48KB 3968 RAM 36I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC18F4525T-I/PT 功能描述:8位微控制器 -MCU 48KB 3968 RAM 36I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC18F452-BL 制造商:POWERLITE SYSTEMS 功能描述:BOOTLOADER PIC18F452 FOR FLASHLAB 制造商:POWERLITE SYSTEMS 功能描述:BOOTLOADER, PIC18F452, FOR FLASHLAB 制造商:POWERLITE SYSTEMS 功能描述:BOOTLOADER, PIC18F452, FOR FLASHLAB, Silicon Manufacturer:Powerlite Systems, Cor 制造商:POWERLITE SYSTEMS 功能描述:PIC18F452 W/ BOOTLOADER, FOR FLASHLAB, Silicon Manufacturer:Powerlite Systems, Core Architecture:PIC, Core Sub-Architecture:PIC18F, Kit Contents:Board , RoHS Compliant: Yes
PIC18F452-E/L 功能描述:8位微控制器 -MCU 32KB 1536 RAM 34I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT