MC68HC05F8 Datasheet, PDF (72/126 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor(HCMOS) microcontroller unit

Freescale Semiconductor, Inc.
8.2
General Operation
Figure 8-1 shows a block diagram of the Manchester encoder/decoder. Logic flow of the hardware
operation of the encoder and decoder are shown in Figure 8-2 and Figure 8-3 respectively.
MC68HC05F8 INTERNAL BUS
INTERNAL BUS CLOCK
INT
DIVIDER
ENCODE
REGISTER
PRESCALER
ENCODE
SHIFT REGISTER
MANCHESTER ENCODER LOGIC
ENCOOUT
INTERRUPT
GENERATOR
ENCODE CONTROL
8
NCE NIE
CIE DCE DIE BR1 BR0
MANCD CONTROL REGISTER
DECODE
REGISTER
NCM NCC DCF OVF MANCD STATUS REGISTER
DECODE CONTROL
DECODE
SHIFT REGISTER
MANCHESTER DECODER LOGIC
DECOIN
Figure 8-1 Manchester Encoder/Decoder Block Diagram
8.2.1 Encoder
The Manchester Encoder is used to convert data from NRZ format to Manchester Code format;
and output onto the ENCOOUT pin.
MOTOROLA
8-2
MANCHESTER ENCODER/DECODER
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MC68HC05F8