DV164101 Microchip Technology, DV164101 Datasheet - Page 54

• Manufacturer Part Number: DV164101
• Description: KIT DEV PICKIT1 FLASH 8/14PIN
• Manufacturer: Microchip Technology
• Series: PICkit™ 1r
• Type: MCUr

Specifications of DV164101

• Contents: PIC Kit 1 Circuit Board, CD-ROMs, USB Interface Cable and Booklet
• Processor To Be Evaluated: PIC12F675
• Interface Type: USB
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC12, PIC16
• Silicon Core Number: PIC12F, PIC16F
• Silicon Family Name: PIC12F6xx, PIC16F6xx
• Rohs Compliant: NA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: Microchip's 8-14 Pin FLASH Microcontrollers
• For Use With: AC164122 - BOARD DAUGHT PICTAIL SD/MMC CARDAC164120 - BOARD SIGNAL ANALYSIS PICKIT
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: DV164101R; DV164101R

PICkit
DS40051D-page 50
™
1 Flash Starter Kit User’s Guide
C.4.2.2
Implementing a state machine in C is quite simple to visualize. C based state machines
rely on the “switch” statement. The following example code shows a “switch” statement
being used as a state machine.
EXAMPLE C-1:
Creating a state machine in assembly is a little more difficult. In assembly, the program
flow is directed to the appropriate software module for a given state by incrementing
the Program Counter by the state variable. Incrementing the Program Counter is
comprised of incrementing PCL and PCLATH (when PCL overflows.) If a provision of
increment PCLATH is not included, then there is a risk of jumping to the wrong spot in
the program if PCL overflows. Immediately following the increment routine is a list of
“goto” statements that direct the program flow to one of the states. This method is
called a “computed goto”. The following example code shows how to use a computed
goto for a state machine.
switch (STATE) {
}
TRANSLATING STATE MACHINES INTO ASSEMBLY AND C
case (State0):
case (State1):
case (State2);
... and so on
default:
SWITCH STATEMENT
// turn LED0 on
break;
// turn LED1 on
break;
// turn LED2 on
break;
STATE = State0
state occurs,
// re-initialize the state machine
// if for some reason a undefined
 2004 Microchip Technology Inc.