Transmitter And Receiver; System Block Diagram - Motorola M68HC08 Designer Reference Manual

CRYSTAL
OSCILLATOR
(DISCRETE)
FSK
MODULATION
BY SWITCHING
LOADING
CAPACITOR
MC68HC908QY4
I/O
I/O
INPUT
DIRECTION
WIRELESS OPTICAL MOUSE

1.4 Transmitter and Receiver

High Data Rate Wireless USB Optical Mouse Solution
MOTOROLA
Freescale Semiconductor, Inc.
LOOP
ANTENNA
TWO-STAGE
AMPLIFIER
(DISCRETE)
AMP
13.5225 MHz/
13.5725 MHz
DATA
OUTPUT
Figure 1-1. System Block Diagram
On the transmitter side:
The data generated from a displacement detection / button status in the
mouse application is encoded with a pre-defined serial type protocol
handled by firmware in the MCU. In the RF stage, the encoded data is used
for FSK modulation.
On the receiver side:
The captured data from the RF receiver stage is decoded with a
corresponding packet format used for mouse applications. The final data is
sent to the host through the USB interface.
System Overview
For More Information On This Product,
Go to: www.freescale.com
LOOP
ANTENNA
xx3361
MIXER
LO
26.59 MHz/
26.64 MHz
MC68HC908JB12
DATA
INPUT
USB RECEIVER
System Overview
Transmitter and Receiver
455 kHz
FILTER
FSK
455 kHz
DEMODULATOR
QUAD COIL
AMP
PC HOST
USB
DRM055
11