MC68HC708AS48 FREESCALE [Freescale Semiconductor, Inc], MC68HC708AS48 Datasheet - Page 359

• Manufacturer Part Number: MC68HC708AS48
• Description: Advance Information
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

MC68HC708AS48
MOTOROLA
NOTE:
—
Rev. 4.0
ATE — Analog Transceiver Enable Bit
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
BO3–BO0 — BARD Offset Bits
The analog transceiver enable (ATE) bit is used to select either the
on-board or an off-chip analog transceiver.
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.
Table 20-2
BARD offset values.
1 = Select on-board analog transceiver
0 = Select off-chip analog transceiver
1 = Select normal/true polarity; true non-inverted signal from the
0 = Select inverted polarity, where an external transceiver inverts
Byte Data Link Controller–Digital (BDLC–D)
J1850 bus; for example, the external transceiver does not
invert the receive signal
the receive signal from the J1850 bus
shows the expected transceiver delay with respect to
Byte Data Link Controller–Digital (BDLC–D)
BDLC CPU Interface
Advance Information
359