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MC68HC08AS32A Datasheet(PDF) 85 Page - Motorola, Inc

No. de Pieza. MC68HC08AS32A
Descripción  Microcontrollers
Descarga  296 Pages
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Fabricante  MOTOROLA [Motorola, Inc]
Página de inicio  http://www.freescale.com
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MC68HC08AS32A Datasheet(HTML) 85 Page - Motorola, Inc

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Byte Data Link Controller-Digital (BDLC-D)
BDLC CPU Interface
MC68HC08AS32A — Rev. 1
Data Sheet
MOTOROLA
Byte Data Link Controller-Digital (BDLC-D)
85
ATE — Analog Transceiver Enable Bit
The analog transceiver enable (ATE) bit is used to select either the on-board or
an off-chip analog transceiver.
1 = Select on-board analog transceiver
0 = Select off-chip analog transceiver
NOTE:
This device does not contain an on-board transceiver. This bit should be
programmed to a logic 0 for proper operation.
RXPOL — Receive Pin Polarity Bit
The receive pin polarity (RXPOL) bit is used to select the polarity of an incoming
signal on the receive pin. Some external analog transceivers invert the receive
signal from the J1850 bus before feeding it back to the digital receive pin.
1 = Select normal/true polarity; true non-inverted signal from the J1850 bus;
for example, the external transceiver does not invert the receive signal
0 = Select inverted polarity, where an external transceiver inverts the receive
signal from the J1850 bus
B03–B00 — BARD Offset Bits
Table 4-2 shows the expected transceiver delay with respect to BARD offset
values.
Table 4-2. BDLC Transceiver Delay
BARD Offset Bits B0[3:0]
Corresponding Expected
Transceiver’s Delays (
µs)
0000
9
0001
10
0010
11
0011
12
0100
13
0101
14
0110
15
0111
16
1000
17
1001
18
1010
19
1011
20
1100
21
1101
22
1110
23
1111
24
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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