MC68HC08AS20 Datasheet, PDF (347/386 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

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
BO3–BO0 — BARD Offset Bits
Table 20-3 shows the expected transceiver delay with respect to
BARD offset values.
MC68HC08AS20 — Rev. 4.1
Freescale Semiconductor
Advance Information
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