Vi điều khiển và ứng dụng

Chuyên đề II
Vi điều khiển và ứng dụng
TS Nguyễn Hồng Quang


Khởi tạo dự án

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Chương trình C đầu tiên
#include "p30f4011.h"
int counter; // for TRISB and PORTB declarations
int main (void)
{
counter = 1;
TRISB = 0; // configure PORTB for output
while(1) // do forever
{
PORTB = counter; // send value of ‘counter’ out PORTB
counter++;
}
return 0;
}
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Thêm file


*.gld

 Ví dụ: p30f4011.gld

 *.h
 Ví dụ: p30f4011.h

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Khởi đầu bit
 _FOSC(CSW_FSCM_OFF & FRC_PLL4);

//Clock = 32 MHz
 _FWDT(WDT_OFF);
 _FBORPOR(MCLR_EN & PBOR_OFF &
PWMxL_ACT_HI & PWMxH_ACT_HI);
 _FGS(CODE_PROT_OFF);

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Oscillator configuration
register (FOSC)
The source can be the internal RC oscillator (FRC – internal fast RC oscillator,
LPRC – internal low power RC oscillator) or external oscillator (ERC – external RC
oscillator, XT – external quartz).
•FOS <1:0> - Definition of the clock
source.
•11 - Primary oscillator selected by
FPR<3:0> 10 -Internal low power RC
oscillator

•01 -Internal fast RC oscillator
•00 - Low power 32kHz internal
oscillator (timer 1)

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FPR

7


Watchdog timer (FWDT)
 The basic clock 128kHz of the watchdog

timer
 prescaler A and the second prescaler B.
 With this clock an 8-bit register, the
register reaches the maximum of 255, the
watchdog timer resets the microcontroller

8


Examples

9


FWDT

10


WDT algorthims

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Voltage protection configuration
register (FBORPOR)
 The configuration register of the voltage

protection serves (phục vụ)for defining the
minimum value of the supply voltage
 switching on/off the circuit for reseting the
microcontroller if the supply voltage falls
bellow the specified value
 adjustment of the PWM output

12


Register

13


Program memory protection
configuration register (FGS)

14


Parallel I/O (PIO) Ports
 1. TRIS
 2. LAT
 3. PORT

15

 Data Direction bit is a ‘1’, then

the pin is an input and a ‘0’ is
output
 All port pins are defined as inputs
after a Reset.
 Writes to the latch, write the
latch (LATx)
 The port (PORTx), read the port
pins


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Làm việc với bit

18


Analog pin
 The use of the ADPCFG and TRIS registers

control the operation of the A/D port pins.
 The port pins that are desired as analog
inputs must have their corresponding TRIS
bit set (input).
 If the TRIS bit is cleared (output), the digital
output level (VOH or VOL) will be
converted.

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Input Change Notification Module
 The Input Change Notification module provides the

dsPIC30F devices the ability to generate interrupt on
selected input pins.
 This module is capable of detecting input change-ofstates even in Sleep mode, when the clocks are
disabled.
 There are 10 external signals (CN0 through CN7, CN17
and CN18) that may be selected (enabled) for
generating an interrupt request on a change-of-state.

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Ví dụ về LCD

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Ví dụ về Digital Input

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8.1.2 Sink or Source curent

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Bộ đệm dùng IC chuyên dụng

 P0 chỉ chịu dòng tới 26 mA
 P1, P2 and P3 giới hạn 15 mA.
 8051 chỉ chịu dòng 71 mA.
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Các loại IC đệm

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