Datasheet 搜索 > 微控制器 > Microchip（微芯） > PIC16F684T-I/ST 数据手册 > PIC16F684T-I/ST 开发手册 6/24 页
器件3D模型￥ 18.755
PIC16F684T-I/ST 开发手册 - Microchip（微芯）
制造商:
Microchip（微芯）
分类:
微控制器
封装:
TSSOP-14
描述:
MICROCHIP PIC16F684T-I/ST 微控制器, 8位, 闪存, AEC-Q100, PIC16F6xxx, 20 MHz, 3.5 KB, 128 Byte, 14 引脚, TSSOP
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PIC16F684T-I/ST数据手册
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AN1310
DS01310A-page 6 2010 Microchip Technology Inc.
HARDWARE CONSIDERATIONS
Figure 7 represents a typical connection diagram for
the serial bootloader.
RTS-based MCLR Reset control is optional. When con-
nected, the host PC can use the RTS serial port signal
to pull down the PIC device’s MCLR
pin, allowing the
host PC software to automatically reset the device
when entering the Bootloader mode.
If using a PIC device that requires high voltage (above
V
DD) on MCLR to enter the In-Circuit Serial Program-
ming™ (ICSP™) mode, the RTS/MCLR
diode can
interfere with traditional ICSP programming/debug-
ging. In this case, using an N-channel metal oxide
semiconductor field effect transistor (MOSFET) may be
more appropriate. (See Figure 8.)
An RS-232 transceiver chip typically provides an inter-
nal pull-down resistor on the incoming TXD/RTS sig-
nals. This allows the PIC device to normally see logic
level high on its RX pin (the RS-232 “Idle” state) even
when disconnected at the serial port, DB9 connector.
FIGURE 7: RX PIN SCHEMATIC
FIGURE 8: MOSFET SCHEMATIC
C1
C2
R1
R2
D1
C1+
C1-
C2+
C2-
11
10
V+
2
V-
6
13
8
U2
R3
MCLR#
1
RC6/TX
25
RC7/RX
26
V
DD
U1
C5
RTS
0.1F
0.1F
0.1F
0.1F
10 k
+3.3V
GND
+3.3V
MAX3232
470
GND
+3.3V
1
4
5
6
8
9
3
2
7
+
+
+
470
V
SS
0.1F
J1
DB9
GND
RXD
TXD
C3
C4
1
3
4
5
11
12
PIC
®
Device
C1
C2
R1
R2
C1+
C1-
C2+
C2-
11
10
V+
2
V-
6
13
8
U2
MC LR #
1
RC6/TX
25
RC7/RX
26
V
DD
U1
C5
RTS
0.1F
0.1F
0.1F
0.1F
10 k
+5V
GND
+3.3V
Q1
2N7002
+5V
1
4
5
6
8
9
3
2
7
+
+
+
470
V
SS
0.1F
J1
DB9
GND
RXD
TXD
C3
C4
1
3
4
5
11
12
PIC
®
Device
R2
470
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