MC68HC08AS32CAFN datasheet(85/296 Pages) FREESCALE

85 / 296 page

MC68HC08AS32A — Rev. 1.1

Data Sheet

Freescale Semiconductor

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

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

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