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| 型号： | RFPIC12F675K-E/SS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO20 |
| 封装： | 0.209 INCH, PLASTIC, MO-150, SSOP-20 |
| 文件页数： | 33/123页 |
| 文件大小： | 5438K |
| 代理商： | RFPIC12F675K-E/SS |
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2003 Microchip Technology Inc.
Preliminary
DS70091A-page 15
rfPIC12F675
2.3
PCL and PCLATH
The program counter (PC) is 13-bits wide. The low byte
comes from the PCL register, which is a readable and
writable register. The high byte (PC<12:8>) is not
directly readable or writable and comes from PCLATH.
On any RESET, the PC is cleared. Figure 2-3 shows the
two situations for the loading of the PC. The upper
example in Figure 2-3 shows how the PC is loaded on
a write to PCL (PCLATH<4:0>
→ PCH). The lower
example in Figure 2-3 shows how the PC is loaded
during a CALL or GOTO instruction (PCLATH<4:3>
→
PCH).
FIGURE 2-3:
LOADING OF PC IN
DIFFERENT SITUATIONS
2.3.1
COMPUTED GOTO
A computed GOTO is accomplished by adding an offset
to the program counter (ADDWF PCL). When perform-
ing a table read using a computed GOTO method, care
should be exercised if the table location crosses a PCL
memory boundary (each 256-byte block). Refer to the
Application
Note
“Implementing
a
Table
Read"
(AN556).
2.3.2
STACK
The rfPIC12F675 Family has an 8-level deep x 13-bit
wide hardware stack (see Figure 2-1). The stack space
is not part of either program or data space and the stack
pointer is not readable or writable. The PC is PUSHed
onto the stack when a CALL instruction is executed, or
an interrupt causes a branch. The stack is POPed in
the event of a RETURN,
RETLW
or a RETFIE
instruction execution. PCLATH is not affected by a
PUSH or POP operation.
The stack operates as a circular buffer. This means that
after the stack has been PUSHed eight times, the ninth
push overwrites the value that was stored from the first
push. The tenth push overwrites the second push (and
so on).
PC
12
8
7
0
5
PCLATH<4:0>
PCLATH
Instruction with
ALU result
GOTO, CALL
Opcode <10:0>
8
PC
12
11 10
0
11
PCLATH<4:3>
PCH
PCL
87
2
PCLATH
PCH
PCL
PCL as
Destination
Note 1: There are no STATUS bits to indicate
stack
overflow
or
stack
underflow
conditions.
2: There are no instructions/mnemonics
called PUSH or POP. These are actions
that occur from the execution of the
CALL,
RETURN,
RETLW
and RETFIE
instructions, or the vectoring to an
interrupt address.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| RFPIC12F675K-I/SS | 功能描述:射频微控制器 - MCU 290-350MHz UHF ASK/FSK Transmitter RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:Si100x 数据总线宽度:8 bit 最大时钟频率:24 MHz 程序存储器大小:64 KB 数据 RAM 大小:4 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 + 85 C 封装 / 箱体:LGA-42 安装风格:SMD/SMT 封装:Tube |
| RFPIC12F675KT-I/SS | 功能描述:射频微控制器 - MCU 1 KB Flash FSK ASK RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:Si100x 数据总线宽度:8 bit 最大时钟频率:24 MHz 程序存储器大小:64 KB 数据 RAM 大小:4 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 + 85 C 封装 / 箱体:LGA-42 安装风格:SMD/SMT 封装:Tube |
| RFPMV00 | 制造商:Carlo Gavazzi 功能描述:RSBT ALARM RELAY OUTPUT MODULE |
| RF-PP12/23 | 制造商:Cembre 功能描述:F-CRIMP,BLADE,RED,PP12/23 |
| RFP-QD10 | 功能描述:烙铁 Cartridge Quad PLCC-52 Chip Pkg RoHS:否 制造商:Weller 产品:Soldering Stations 类型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大温度:+ 850 F 电缆类型:US Cord Included |
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