參數(shù)資料
型號： 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)： 111/168頁
文件大?。?/td> 2756K
代理商： PIC16F628A
2004 Microchip Technology Inc.
Preliminary
DS40044B-page 109
PIC16F627A/628A/648A
14.11 In-Circuit Serial Programming
The PIC16F627A/628A/648A microcontrollers can be
serially programmed while in the end application circuit.
This is simply done with two lines for clock and data,
and three other lines for power, ground, and the
programming voltage. This allows customers to manu-
facture boards with unprogrammed devices and then
program the microcontroller just before shipping the
product. This also allows the most recent firmware, or
a custom firmware to be programmed.
The device is placed into a Program/Verify mode by
holding the RB6 and RB7 pins low while raising the
MCLR (V
PP
) pin from V
IL
to V
IHH
(see programming
specification). RB6 becomes the programming clock
and RB7 becomes the programming data. Both RB6
and RB7 are Schmitt Trigger inputs in this mode.
After Reset, to place the device into Programming/Verify
mode, the program counter (PC) is at location 00h. A 6-
bit command is then supplied to the device. Depending
on the command, 14 bits of program data are then
supplied to or from the device, depending if the
command was a load or a read. For complete details of
serial programming, please refer to the Programming
Specifications (DS41196).
A typical In-Circuit Serial Programming connection is
shown in Figure 14-18.
FIGURE 14-18:
TYPICAL IN-CIRCUIT
SERIAL PROGRAMMING
CONNECTION
14.12 Low Voltage Programming
The LVP bit of the configuration word, enables the low
voltage programming. This mode allows the microcon-
troller to be programmed via ICSP using only a 5V
source. This mode removes the requirement of V
IHH
to
be placed on the MCLR pin. The LVP bit is normally
erased to '1' which enables the low voltage program-
ming. In this mode, the RB4/PGM pin is dedicated to
the programming function and ceases to be a general
purpose I/O pin. The device will enter Programming
mode when a '1' is placed on the RB4/PGM pin. The
HV Programming mode is still available by placing V
IHH
on the MCLR pin.
If low-voltage Programming mode is not used, the LVP
bit should be programmed to a '0' so that RB4/PGM
becomes a digital I/O pin. To program the device, V
IHH
must be placed onto MCLR during programming. The
LVP bit may only be programmed when programming
is entered with V
IHH
on MCLR. The LVP bit cannot be
programmed when programming is entered with RB4/
PGM.
It should be noted, that once the LVP bit is programmed
to 0, only high voltage Programming mode can be used
to program the device.
External
Connector
Signals
To Normal
Connections
To Normal
Connections
PIC16F627A/628A/648A
V
DD
V
SS
RA5/MCLR/V
PP
RB6/PGC
RB7/PGD
+5V
0V
V
PP
CLK
Data I/O
V
DD
Note 1:
While in this mode the RB4 pin can no
longer be used as a general purpose I/O
pin.
2:
V
DD
must be 5.0V +10% during erase
operations.
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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 安裝風格:SMD/SMT
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