MPC8309EC datasheet(39/82 Pages) FREESCALE

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MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 0

Freescale Semiconductor

DUART

13 DUART

This section describes the DC and AC electrical specifications for the DUART interface of the MPC8309.

13.1

DUART DC Electrical Characteristics

Table 37 provides the DC electrical characteristics for the DUART interface of the MPC8309.

13.2

DUART AC Electrical Specifications

Table 38 provides the AC timing parameters for the DUART interface of the MPC8309.

Table 37. DUART DC Electrical Characteristics

Parameter

Symbol

Min

Max

Unit

High-level input voltage

VIH

2OVDD +0.3

Low-level input voltage OVDD

VIL

–0.3

0.8

High-level output voltage, IOH = –100 AVOH

OVDD –0.2

—

Low-level output voltage, IOL = 100 AVOL

—0.2

Input current (0 V

V

IN OVDD)

IIN

—±5

A

Note:

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

Table 38. DUART AC Timing Specifications

Parameter

Value

Unit

Notes

Minimum baud rate

256

baud

Maximum baud rate

>1,000,000

baud

Oversample rate

—

Notes:

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

2. 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.

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