mc68hc05bs8 Freescale Semiconductor, Inc, mc68hc05bs8 Datasheet - Page 70

• Manufacturer Part Number: mc68hc05bs8
• Description: Mc68hc05 Family Of Low-cost Single-chip Microcontrollers.
• Manufacturer: Freescale Semiconductor, Inc

8
8-10
Write to MDR
transmitted?
RXAK=0?
Last byte
N
Y
TX
Y
N
Generate
TX/RX?
STOP
signal
Figure 8-4 Flowchart of M-Bus Interrupt Routine
RX
byte to read?
Last byte to
be read?
Last 2nd
TXAK=1
N
Y
M-BUS SERIAL INTERFACE
N
Y
Read from MDR
Y
Generate
STOP
signal
Master Mode?
Clear MIF
RTI
RX
Write to MDR
MAAS=1?
ACK from
receiver?
TX/RX?
N
TX
N
Y
Dummy read MDR
Y
N
Set RX mode
N
N
MC68HC05BS8
Write to MDR
Set TX mode
Clear MAL
MAAS=1?
Arbitration
SRW=1?
Lost?
Y
Y
Y
N
TPG