MC68HC705BD3 FREESCALE [Freescale Semiconductor, Inc], MC68HC705BD3 Datasheet - Page 56

• Manufacturer Part Number: MC68HC705BD3
• Description: High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

7
7-10
Write to MDR
transmitted?
RXAK=0?
Last byte
N
Y
TX
Y
N
Generate
TX/RX?
STOP
signal
Figure 7-4 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
MC68HC05BD3
Write to MDR
Set TX mode
Clear MAL
MAAS=1?
Arbitration
SRW=1?
Lost?
Y
Y
Y
N
TPG