Listing 1: Pseudo-code for a simple toy

; --- Power-on reset entry point
; --- Enable interrupts on falling edge of triggers 1 (tummy switch)
; --- and 2 (gravity switch), and rising edge of trigger 2.
POR: LD INT_ENABLE, TG1_LO OR TG2_LO OR TG2_HI
LD	R0, GIGGLE	; Register 0 is used to store the next sound 
; to be
played when the tummy switch is pressed.
STOP	; Power down and wait for interrupt.


; --- Micro jumps here when trigger 1 detects a falling edge (tummy switch is pressed).
; --- Note: Switch debouncing is performed in hardware by the microcontroller. 
; --- The input pins also have internal pull-ups, so no external parts are 
; --- required.
TG1_LO:	[rampin]	; This is a vendor-supplied macro that ramps 
; the ADPCM decoder output up to its center 
; point
JMP	R0, TG2_HI	; If
the doll is upright (TG2 = high), play 
; one ofthe three tummy behavior sounds below.
[cry]	; Otherwise, cry
[rampout]	; Ramp the decoder output back to 0V
STOP


; --- Tummy behavior #1
GIGGLE:	[giggle]	; Play the giggle sound
LD	R0, LAUGH	; Next time around, we will laugh
[rampout]	; Ramp the decoder output back to 0V
STOP


; --- Tummy behavior #2
LAUGH:	[laugh]	; Play the laughing sound
LD	R0, NONSENSE	; Next time around, we will talk nonsense
[rampout]	; Ramp the decoder output back to 0V
STOP


; --- Tummy behavior #3
NONSENSE:	[nonsense]	; Play a happy-sounding baby-talk phrase
LD	R0, GIGGLE	; Loop back around to the first sound in the series
[rampout]	; Ramp the decoder output back to 0V
STOP


; --- Micro jumps here when trigger 2 detects a falling edge (doll is laid down).
TG2_LO:	[rampin]	; Ramp the decoder output to its center point 
[snore]	; Snore for a little while
[rampout]	; Ramp the decoder output back to 0V
STOP


; --- Micro jumps here when trigger 1 detects a rising edge (doll is stood up).
TG1_HI:	[rampin]	; Ramp the decoder output to its center point
[yawn]	; Good morning! Yawn.
[rampout]	; Ramp the decoder output back to 0V
STOP