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| 型號： | PIC16C505 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 14-Pin, 8-Bit CMOS Microcontroller(每個I/O口有25mA驅(qū)動/吸收電流,12個I/O口，帶WDT的微控制器) |
| 中文描述： | 14引腳，8位CMOS微控制器（每個的I / O口有25毫安驅(qū)動/吸收電流，12個的I / O口，帶看門狗的微控制器） |
| 文件頁數(shù)： | 17/80頁 |
| 文件大?。?/td> | 617K |
| 代理商： | PIC16C505 |
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1998 Microchip Technology Inc.
Preliminary
DS40192A-page 17
PIC16C505
4.6
Program Counter
As a program instruction is executed, the Program
Counter (PC) will contain the address of the next
program instruction to be executed. The PC value is
increased by one every instruction cycle, unless an
instruction changes the PC.
For a
GOTO
instruction, bits 8:0 of the PC are provided
by the
GOTO
instruction word. The PC Latch (PCL) is
mapped to PC<7:0>. Bit 5 of the STATUS register
provides page information to bit 9 of the PC (Figure 4-
6).
For a
CALL
instruction, or any instruction where the
PCL is the destination, bits 7:0 of the PC again are
provided by the instruction word. However, PC<8>
does not come from the instruction word, but is always
cleared (Figure 4-6).
Instructions where the PCL is the destination, or
Modify PCL instructions, include
MOVWF PC, ADDWF
PC,
and
BSF PC,5.
FIGURE 4-6:
LOADING OF PC
BRANCH INSTRUCTIONS -
PIC16C505
Note:
Because PC<8> is cleared in the
CALL
instruction, or any Modify PCL instruction,
all subroutine calls or computed jumps are
limited to the first 256 locations of any pro-
gram memory page (512 words long).
PA0
STATUS
PC
8
7
0
PCL
9
10
Instruction Word
7
0
GOTO
Instruction
11
CALL
or Modify PCL Instruction
PA0
STATUS
PC
8
7
0
PCL
9
10
Instruction Word
7
0
11
Reset to ‘0’
4.6.1
EFFECTS OF RESET
The Program Counter is set upon a RESET, which
means that the PC addresses the last location in the
last page i.e., the oscillator calibration instruction. After
executing MOVLW XX, the PC will roll over to location
00h, and begin executing user code.
The STATUS register page preselect bits are cleared
upon a RESET, which means that page 0 is pre-
selected.
Therefore, upon a RESET, a
GOTO
instruction will
automatically cause the program to jump to page 0
until the value of the page bits is altered.
4.7
Stack
PIC16C505 devices have a 12-bit wide hardware
push/pop stack.
A
CALL
instruction will pushthe current value of stack
1 into stack 2 and then push the current program
counter value, incremented by one, into stack level 1. If
more than two sequential
CALL
’s are executed, only
the most recent two return addresses are stored.
A
RETLW
instruction will popthe contents of stack level
1 into the program counter and then copy stack level 2
contents into level 1. If more than two sequential
RETLW
’s are executed, the stack will be filled with the
address previously stored in level 2. Note that the
W register will be loaded with the literal value specified
in the instruction. This is particularly useful for the
implementation of data look-up tables within the
program memory.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIC16C505/JW | 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC16C505-04/P | 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 4MHz PDIP14 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC16C505-04/P | 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU (TUBE 30) 16C505 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 16C505 DIP14 |
| PIC16C505-04/SL | 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 4MHz SOIC14 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC16C505-04/SL | 制造商:Microchip Technology Inc 功能描述:8BIT CMOS MCU SMD 16C505 SOIC14 |
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