5. Micro Controller :
8K Bytes of In-System Reprogrammable
Flash Memory
Endurance: 1,000 Write/Erase Cycles
Fully Static Operation: 0 Hz to 24 MHz
Three-level Program Memory Lock
256 x 8-bit Internal RAM
32 Programmable I/O Lines
Three 16-bit Timer/Counters
Eight Interrupt Sources
Programmable Serial Channel
Low-power Idle and Power-down Modes
6. Stepper Motor Types :
• Unipolar Stepper Motor: Unipolar stepper motors are
characterised by their center-tapped windings.
7. Bipolar Stepper Motor: Bipolar stepper motors are
designed with separate coils.
8. • Hybrid Stepper Motor : Variable reluctance stepper motor (also
called hybrid motors) are characterised by one common lead.
9. Motor Driver :
• Output current up to
500mA
• Output voltage up to 50V
• Internal suppression
diodes
• Eight Darlington with
eight emitters
• Outputs can be
parallelized
10. DTMF:
Dual-tone multi-frequency signaling (DTMF)
is used for telecommunication signallingover
analog telephone lines in the voice-frequency
band between telephone handsets and other
communications devices and the switching
center.
A DTMF signal is the algebraic sum of two
different audio frequencies, and can be expressed
as follows:
f(t) = A0sin(2*П*fa*t) + B0sin(2*П*fb*t) +
………..
11. • The frequencies associated with various keys on the
keypad are shown in figure (A).
