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器件3D模型￥ 47.026
PIC16C72A-20I/SP 产品设计参考手册 - Microchip（微芯）
制造商:
Microchip（微芯）
分类:
微控制器
封装:
SPDIP-28
描述:
MICROCHIP PIC16C72A-20I/SP 微控制器, 8位, 一次性可编程, PIC16C7xx, 20 MHz, 3.5 KB, 128 Byte, 28 引脚, NDIP
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3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
原理图在P94P98P100P106P107P110P112P113P114
应用领域在P29P83
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PIC16C72A-20I/SP数据手册
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© 2009 Microchip Technology Inc.Page 1-2 DS01146B
8-pin Flash PIC
®
Microcontroller Tips ‘n Tricks
TIP #1 Dual Speed RC Oscillator
Figure 1-1
PIC12F6XX
OSC1
GP0
+5V
R2
R1
C
1. After reset I/O pin is High-Z
2. Output ‘1’ on I/O pin
3. R1, R2 and C determine OSC frequency
4. Also works with additional capacitors
Frequency of PIC MCU in external RC oscillator
mode depends on resistance and capacitance
on OSC1 pin. Resistance is changed by the
output voltage on GP0. GP0 output ‘1’ puts R2
in parallel with R1 reduces OSC1 resistance
and increases OSC1 frequency. GP0 as
an input increases the OSC1 resistance
by minimizing current ow through R2, and
decreases frequency and power consumption.
Summary:
GP0 = Input: Slow speed for low current
GP0 = Output high: High speed for fast
processing
TIP #2 Input/Output Multiplexing
Individual diodes and some combination of
diodes can be enabled by driving I/Os high and
low or switching to inputs (Z). The number of
diodes (D) that can be controlled depends on
the number of I/Os (GP) used.
The equation is: D = GP x (GP - 1).
Example 2-1: Six LEDs on Three I/O Pins
GPx LEDs
0 1 2
0 0 0
0 1 Z
1 0 Z
Z 0 1
Z 1 0
0 Z 1
1 Z 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
1 2 3 4 5 6
0 0 0 0 0 0
1 0 0 0 0 0
0 1 0 0 0 0
0 0 1 0 0 0
0 0 0 1 0 0
0 0 0 0 1 0
0 0 0 0 0 1
0 0 1 0 1 0
1 0 0 1 0 0
1 0 0 0 1 0
0 1 0 0 0 1
0 1 1 0 0 0
0 0 0 1 0 1
0 0 0 0 0 0
Figure 2-1
PIC12F6XX
1
2 5
4
3
6
GP0
GP1
GP2
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