About Diviner pic configuration bits tool
HFINTOSC; NDIV 2; OSCCON1 = 0x61; // CSWHOLD may proceed; SOSCPWR Low power; OSCCON3 = 0x00; // MFOEN disabled; LFOEN disabled; ADOEN disabled; SOSCEN disabled; EXTOEN disabled; HFOEN disabled; OSCEN = 0x00; // HFFRQ 16_MHz; OSCFRQ = 0x05; // TUN 0; OSCTUNE = 0x00;}This code sets the various SFRs associated with the PIC18F47Q10’s Oscillator Module – covered in Section 4 of the datasheet. Reviewing some of the code, specifically, OSCCON1 = 0x61;sets the OSCCON1 (OSCillator CONtrol Register 1) an SFR at address 0xED3 to 0110 0001b.The processor specific header file pic18f47q10.h contains the symbol definition for OSCCON1:// Register: OSCCON1#define OSCCON1 OSCCON1extern volatile unsigned char OSCCON1 __at(0xED3);#ifndef _LIB_BUILDasm("OSCCON1 equ 0ED3h");#endifThe data sheet shows OSCCON1 contains two setting for the new oscillator, the requested new oscillator source - Bits 6:4 NOSC[2:0] and the requested new the clock divider Bits 3:0 NDIV[3:0]. The values being set for the new oscillator – 110b specify the HFINTOSC (High Frequency INTernal OSCillator):With a Clock Divider of 2 (2:1):This sets the new processor clock to 4MHz / 2 or 2 MHz. There is clearly even more configuration needed to get to the requested clock frequency of 8MHz -16MHz HFINTOSC frequency with a CDIV of 2.Continuing to review the Oscillator Module control registers, the OSCFRQ SFR looks like a good candidate. Looking at how the MCC generated code sets OSCFRQ:OSCFRQ = 0x05;It appears that MCC is setting OSCFREQ Bits 3:0 (HFFRQ[3:0]) to 0101b, which matches the 16MHz configured in the MCC GUI:As can be seen in remainder of the OSCILLATOR_Initialize() implementation, MCC generated code configuring some additional oscillator control registers. As the project’s configuration requirements did not specifically change any of these other values, MCC generated “defaults” for the project. Using the techniques used to dissect how the oscillator control registers were used by MCC to change the clock speed to the configuration specified 8 MHz, investigating the remainder of the generated in OSCILLATOR_Initialize() method is straight forward.SummaryThe post started with a look at PIC memory organization and the concept of registers. After a quick review of project creation detailed in a prior post, this post explored configuration sources, including Configuration Words and SFR, and how the former solves the issue of providing oscillator and clock settings needed as the processor is starting. Finally looking at a code generated through MCC for the specified project configuration demonstrated how Configuration Words values are set via compiler directives for values needed at processor start up as well as how SFRs can update the oscillator configuration with application code to fine tune the processor clock configuration. While not particularly complex, configuring the startup oscillator selection and clock speed is more complex than many configuration tasks due to the need to program flash locations via compiler directives to get the processor started and then through SFRs once the processor is started. It is managing these complexities where MCC can be very helpful in getting a basic project structure in place for getting the processor started.
Key features of the Diviner pic configuration bits tool that are enabled through these drivers include:
- 02 Set Configure bit of PIC controller
- Configuration Bits in Mid-Range PIC Microcontrollers
- Tutorial for Configuration Bits setting PIC32 (32 Bit PIC
- Configuration Bits for 16-bit PIC MCUs - Developer Help
- LIN Driver Configuration Tool for PIC Microcontrollers
- How do you set the configuration bits for a PIC
- How to read configuration bit register from PIC?
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