MC68HC05E5 Datasheet, PDF (85/140 Pages) Freescale Semiconductor, Inc – General Release Specification

Freescale Semiconductor, Inc.
Motorola Bus (M Bus) Interface
M-Bus Registers
CLEAR MIF
Y
MASTER
N
MODE
TX
LAST BYTE ^Y
TRANSMITTED
N
RXAK=0
N
Y
WRITE NEXT
BYTE TO MDR
TX/RX
RX
LAST BYTE
Y
TO BE READ
N
SET TXAK = 1
LAST 2nd BYTE
TO BE READ
N
GENERATE
STOP SIGNAL
CLEAR MAL
Y _ARBITRATION
LOST
N
Y
N
MAAS = 1
Y
Y (READ)
SRW = 1
SET
TX MODE
N (WRITE)
MAAS = 1
N
RX
TX/RX
TX
READ MDR
AND STORE
GENERATE
STOP SIGNAL
READ DATA FROM
MDR AND STORE
WRITE
TO MDR
Y _{ACK FROM}
RECEIVER
TX NEXT N
BYTE
SET
RX MODE
SWITCH TO
RX MODE
DUMMY READ
FROM MDR
DUMMY READ
FROM MDR
RTI
Figure 11-9. Flowchart of M-Bus Interrupt Routine
MC68HC05E5 — Rev. 1.0
General Release Specification
Motorola Bus (M Bus) Interface
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