PIC18F86J72-I/PT Microchip Technology, PIC18F86J72-I/PT Datasheet - Page 289

• Manufacturer Part Number: PIC18F86J72-I/PT
• Description: IC PIC MCU 8BIT 14KB FLSH 80TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F86J72-I/PT

• Program Memory Type: FLASH
• Program Memory Size: 64KB (32K x 16)
• Package / Case: 80-TQFP
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, LVD, POR, PWM, WDT
• Number Of I /o: 51
• Ram Size: 3.8K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 12x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: SPI, USART, SPI, I2C
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 51
• Number Of Timers: 4
• Operating Supply Voltage: 2 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 14
• Controller Family/series: PIC18F
• No. Of I/o's: 51
• Ram Memory Size: 3923Byte
• Cpu Speed: 12MIPS
• No. Of Timers: 4
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Example 22-1 provides a general outline for imple-
menting a driver routine for the AFE. Example 22-2
through Example 22-5 show the details for each step.
The example shown here assumes the following
loopback connections:
• RC4 (SDI) to SDOA
• RC5 (SDO) to SDIA
• RC3 (SCK) to SCKA
• RD0 to ARESET
• RD7 to CSA
• RC2 (CCP1) to CLKIA
• RB0 (INT0) to DR
EXAMPLE 22-1:
 2010 Microchip Technology Inc.
///////////////////////////////////////////////////////////////////////////////////////////////
// Outline of a typical driver routine for the dual-channel AFE.
///////////////////////////////////////////////////////////////////////////////////////////////
#include "p18F87J72.h"
void main(void)
{
///////////////////////////////////////////////////////////////////////////////////
// STEP 1:Initialize MSSP (Example 22-2)
////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////
// STEP 2: Issue Reset to AFE (Example 22-2)
/////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////
// STEPS 3: Disable all Chip Selects on all SPI devices (Example 22-2)
////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////
// STEP 4: Write to AFE registers; read back (optionally) to confirm settings (Example 22-4)
////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////
// STEP 5: Configure CCP1 to serve as AFE clock source (Example 22-3)
/////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////
///STEP 6: Configure Interrupt INT0 for use with DR pin (Example 22-3)
/////////////////////////////////////////////////////////////////////////////////////////////
while(1);
}
/////////////////////////////////////////////////////////////////////////////////////////////
//STEP 7: ISR for reading AFE data (Example 22-5)
////////////////////////////////////////////////////////////////////////////////////////////
OVERALL STRUCTURE FOR USING THE AFE
Preliminary
PIC18F87J72 FAMILY
Aside from the SPI, which is determined by the
microcontroller’s single MSSP module, the other
connections may change based on the particular appli-
cation’s requirements. For example, the AFE clock on
CLKIA is generated from the PWM of CCP1 in this
demonstration; other clock sources may be available.
Users should modify the individual code segments
accordingly.
DS39979A-page 289