MPC8548ECPXAUJC datasheet(26/151 Pages) FREESCALE

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MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9

Freescale Semiconductor

DUART

This section describes the DC and AC electrical specifications for the DUART interface of the device.

7.1

DUART DC Electrical Characteristics

This table provides the DC electrical characteristics for the DUART interface.

7.2

DUART AC Electrical Specifications

This table provides the AC timing parameters for the DUART interface.

Table 20. DUART DC Electrical Characteristics

Parameter

Symbol

Min

Max

Unit

High-level input voltage

VIH

2OVDD + 0.3

Low-level input voltage

VIL

–0.3

0.8

Input current (VIN

1 = 0 V or V

IN = VDD)

IIN

—±5

A

High-level output voltage (OVDD = min, IOH = –2 mA)

VOH

2.4

—

Low-level output voltage (OVDD = min, IOL = 2 mA)

VOL

—0.4

Note:

1. Note that the symbol VIN, in this case, represents the OVIN symbol referenced in Table 1 and Table 2.

Table 21. DUART AC Timing Specifications

Parameter

Value

Unit

Notes

Minimum baud rate

fCCB/1,048,576

baud

1, 2

Maximum baud rate

fCCB/16

baud

1, 2, 3

Oversample rate

—

1, 4

Notes:

1. Guaranteed by design.

2. fCCB refers to the internal platform clock.

3. Actual attainable baud rate is limited by the latency of interrupt processing.

4. The middle of a start bit is detected as the 8th sampled 0 after the 1-to-0 transition of the start bit. Subsequent bit values are

sampled each 16th sample.

MPC8548ECPXAUJC 数据表(PDF) 26 Page - Freescale Semiconductor, Inc

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