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and increment the hours. Using this algorithm, the clock can roll over 12 hours in just 20 seconds a lot faster than if you were to hold an incrementing minutes button down. In addition, it offers nice capabilities to set the clock accurately because the incrementing period changes according to how long the button is pressed. The most complex part of the application is the Timeupdate subroutine. This subroutine is complex because the upper 4 bits of PORTB are used to select which 74LS154 is enabled for output (with the lower 4 bits selecting the 16-bit output of the 74LS154). The code for updating the time uses the Minutes variable, and adding the passed value to it appropriately updates both the minutes and hours depending on the result.
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Timeupdate: addwf movlw subwf btfss goto clrf incf Andwf xorlw btfsc movlw xorlw movwf Minutes, f 60 Minutes, w STATUS, C TUMinutes Minutes PORTA, w 0x00F 0x00C STATUS, Z 0x00C 0x00C PORTA ; ; ; Add contents of w to PORTB (Minutes) Save the Update Are the Minutes Rolled Over
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No, Just Save the New Value Reset the Minutes Do the Hours get Incremented
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TUMinutes: movlw 0x00F andwf Minutes, w movwf Temp call Get154 iorwf Temp, w movwf PORTB return Get154: movlw movwf swapf andlw addlw btfsc incf movwf
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Convert Minutes to LED Positions Get the 16 Minute selection
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Get the enable for the speci c `154 Combine with the Minutes for the `154
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; HIGH Get154Table PCLATH Minutes, w 2 LOW Get154Table STATUS, C PCLATH PCL
Use the MS 2 Bits of Minutes to ; Get the `154 Enable Setting
Compute the Table Address
MID-RANGE DEVICES
Get154Table: retlw 0x0E0 retlw 0x0D0 retlw 0x0B0 retlw 0x070
; ; ; ;
Minutes Minutes Minutes Minutes
0 15 16 31 32 47 48 59
This code takes a maximum of 34 instruction cycles to execute. This code, with the code presented above, means that the vast majority of time the PIC microcontroller spends processing in this application is spent polling the T0IF ag instead of calculating the new LED s display value. This is important to avoid any possibility that the T0IF ag being set is missed (and the time is lost). xmas: CHRISTMAS DECORATION WITH BLINKING LIGHT AND MUSIC If you look through the hobbyist electronics magazines in December, you are sure to find a number of flashing-light PIC microcontroller applications. These applications usually use a number of LEDs to flash on and off in a seemingly random pattern. These lights are often put in a Christmas tree decorations or a stand-alone decoration, as shown in the X mas project (Fig. 21.16), which has 15 flashing LEDs and can play a tune. This is the third time I ve created a lighted Christmas tree with a PIC microcontroller. In the rst case, I hand-wired all the connections (which made it truly horri c to wire).
Figure 21.16 The Christmas tree decoration with stickers for ornaments.
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The second version used a predesigned PCB card, but the design was lost in a hard le crash (before I started religiously backing up les onto CD-ROM), and the software was written for an early PIC microcontroller compiler that never worked extremely well. I ended up updating it just for the light application (and the tune generator that went with it). Also with the second version, I created an unnecessarily complex tune generator that requires two separate PC applications to run before the code could be built with the tune installed. This third version avoids the problems of the other two, and by using LEDs with leads soldered to them, the build time for the entire project is just a few hours (not including decoration paint drying time). The application supports up to 16 LED outputs, a speaker with software that can drive a 128-note tune, and a built-in power supply, so the application can be run from a wall-mounted ac/dc adapter. The schematic is shown in Fig. 21.17. The bill of materials is listed in Table 21.7. There are a couple of things to notice in this application. The rst is that there is no on/off switch for power. I left this off because I assumed that once power was applied, the decoration would run continuously. Next, I do not interconnect the 74LS374s, which are used as shift registers, because there are ample pins available for the application, and randomizing can be done in software. Lastly, I used a 3.58-MHz ceramic resonator instead of my typical 4.0-MHz one because I ran out of 4-MHz ceramic resonators. This change did not result in a major problem with timing the application, as will be discussed below. The macro calculator was used for calculating delays, and a 4-MHz ceramic resonator or crystal could be substituted in its place. The software used to run the application could be considered to be a simple multitasker with two processes. The critical process is the tune process, which plays a tune programmed into a tape. The other process is a pseudorandom number generator using as a linear feedback shift register that runs in the foreground. The application can be modeled as
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