參數(shù)資料
型號(hào)： PIC16F628A
廠商： Microchip Technology Inc.
英文描述： 18-pin Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology(18引腳，基于FLASH的8位CMOS微控制器，使用毫微瓦特技術(shù))
中文描述： 18引腳基于閃存的8位CMOS微控制器與納瓦技術(shù)（18引腳，基于閃存的8位的CMOS微控制器，使用毫微瓦特技術(shù)）
文件頁數(shù)： 11/168頁
文件大小： 2756K
代理商： PIC16F628A
2004 Microchip Technology Inc.
Preliminary
DS40044B-page 9
PIC16F627A/628A/648A
3.0
ARCHITECTURAL OVERVIEW
The high performance of the PIC16F627A/628A/648A
family can be attributed to a number of architectural
features commonly found in RISC microprocessors. To
begin with, the PIC16F627A/628A/648A uses a
Harvard architecture, in which program and data are
accessed from separate memories using separate
busses. This improves bandwidth over traditional Von
Neumann architecture where program and data are
fetched from the same memory. Separating program
and data memory further allows instructions to be sized
differently than 8-bit wide data word. Instruction
opcodes are 14-bits wide making it possible to have all
single word instructions. A 14-bit wide program mem-
ory access bus fetches a 14-bit instruction in a single
cycle. A two-stage pipeline overlaps fetch and execu-
tion of instructions. Consequently, all instructions (35)
execute in a single-cycle (200 ns @ 20 MHz) except for
program branches.
Table 3-1 lists device memory sizes (Flash, Data and
EEPROM).
TABLE 3-1:
DEVICE MEMORY LIST
The PIC16F627A/628A/648A can directly or indirectly
address its register files or data memory. All Special
Function Registers (SFR), including the program
counter, are mapped in the data memory. The
PIC16F627A/628A/648A have an orthogonal (symmet-
rical) instruction set that makes it possible to carry out
any operation, on any register, using any Addressing
mode. This symmetrical nature and lack of ‘special
optimal situations’ make programming with the
PIC16F627A/628A/648A simple yet efficient. In
addition, the learning curve is reduced significantly.
The PIC16F627A/628A/648A devices contain an 8-bit
ALU and working register. The ALU is a general
purpose arithmetic unit. It performs arithmetic and
Boolean functions between data in the working register
and any register file.
The ALU is 8-bit wide and capable of addition,
subtraction, shift and logical operations. Unless
otherwise mentioned, arithmetic operations are two's
complement in nature. In two-operand instructions,
typically one operand is the working register
(W register). The other operand is a file register or an
immediate constant. In single operand instructions, the
operand is either the W register or a file register.
The W register is an 8-bit working register used for ALU
operations. It is not an addressable register.
Depending on the instruction executed, the ALU may
affect the values of the Carry (C), Digit Carry (DC), and
Zero (Z) bits in the Status Register. The C and DC bits
operate as a Borrow and Digit Borrow out bit,
respectively, bit in subtraction. See the
SUBLW
and
SUBWF
instructions for examples.
A simplified block diagram is shown in Figure 3-1, and
a description of the device pins in Table 3-2.
Two types of data memory are provided on the
PIC16F627A/628A/648A
EEPROM data memory is provided for long term stor-
age of data such as calibration values, look up table
data, and any other data which may require periodic
updating in the field. These data are not lost when
power is removed. The other data memory provided is
regular RAM data memory. Regular RAM data memory
is provided for temporary storage of data during normal
operation. Data are lost when power is removed.
devices.
Nonvolatile
Device
Memory
Flash
Program
RAM
Data
EEPROM
Data
PIC16F627A
1024 x 14
224 x 8
128 x 8
PIC16F628A
2048 x 14
224 x 8
128 x 8
PIC16F648A
4096 x 14
256 x 8
256 x 8
PIC16LF627A
1024 x 14
224 x 8
128 x 8
PIC16LF628A
2048 x 14
224 x 8
128 x 8
PIC16LF648A
4096 x 14
256 x 8
256 x 8
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC16F628A-E/ML 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
PIC16F628A-E/P 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
PIC16F628A-E/SO 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
PIC16F628A-E/SS 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
PIC16F628A-I/ML 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
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