aduc7030 Analog Devices, Inc., aduc7030 Datasheet - Page 138
aduc7030
Manufacturer Part Number
aduc7030
Description
Integrated Precision Battery Sensor For Automotive
Manufacturer
Analog Devices, Inc.
Datasheet
1.ADUC7030.pdf
(150 pages)
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ADuC7030/ADuC7033
LIN Frame Data Transmission and Reception
Once the Break Symbol and Synchronization Byte have being
correctly received, data is transmitted and received via the
COMTX and COMRX MMRs, after configuration of the UART
to the required Baud Rate. To configure the UART for use with
LIN requires the use of the following UART MMRs:
- COMDIV0: divisor latch (low byte)
- COMDIV1: divisor latch (high byte)
- COMDIV2: 16-bit fractional baud divide register. The
required values for COMDIV0, COMDIV1 and COMDIV2 are
derived from the LHSVAL0, to generate the required baud rate.
- COMCON0: line control register. Once the UART is correctly
configured, the LIN protocol for receiving and transmitting
data is identical to the UART specification. To manage data on
the LIN bus requires use of the following UART MMRs:
BREAK
START
START
13T
START
BIT
BIT
BIT
> = 14T
BIT
BIT
BIT0
T
T
ID0
T
BIT
BIT
BIT
START
BIT
>1T
BIT
BIT1
ID1
STA S0
Figure 45. LIN Identifier Byte Field
2T
Figure 42. LIN Interface Timing
Figure 44. LIN Synch byte Field
Figure 46. LIN Data Byte Field
BIT
Figure 43. LIN Break Field
Rev. PrE | Page 138 of 150
BIT2
ID2
SYNC
T
S1
BREAK
2T
BIT
8T
S2
BIT3
ID3
BIT
> 13T
S3
2T
BIT
BIT
BIT4
- COMTX: 8-bit transmit register
- COMRX: 8-bit receive register
- COMCON0: line control register
- COMSTA0: line status register
To transmit data on the LIN bus requires that the relevant data
be placed into COMTX. To read data received on the LIN bus
requires the monitoring of COMRX. To ensure that data is
received or transmitted correctly COMSTA0 is monitored. For
more information please refer to the UART section of the
datasheet.
Under software control it is possible to multiplex the UART
data lines (TxD and RxD) to external GPIO pins (GPIO_7 and
GPIO_8). For more information please refer to the description
of the GPIO Port1 Control Register (GP1CON).
S4
ID4
S5
2T
BIT
BIT5
ID5
S6
S7 STO
BIT6
P0
Preliminary Technical Data
DELIMIT
BREAK
BIT7
P1
PROTECTED ID
STOP
STOP
STOP
BIT
BIT
BIT
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