MPC8540 datasheet(21/104 Pages) FREESCALE

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MPC8540 Integrated Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

DUART

7 DUART

This section describes the DC and AC electrical specifications for the DUART interface of the MPC8540.

7.1 DUART DC Electrical Characteristics

Table 19 provides the DC electrical characteristics for the DUART interface of the MPC8540.

7.2 DUART AC Electrical Specifications

Table 20 provides the AC timing parameters for the DUART interface of the MPC8540.

Table 19. 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

μA

High-level output voltage

(OVDD = min, IOH = –100 μA)

VOH

OVDD – 0.2

—

Low-level output voltage

(OVDD = min, IOL = 100 μA)

VOL

—0.2

Note:

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

and Table 2.

Table 20. DUART AC Timing Specifications

Parameter

Value

Unit

Notes

Minimum baud rate

fCCB_CLK / 1048576

baud

Maximum baud rate

fCCB_CLK / 16

baud

1, 3

Oversample rate

—

2, 3

Notes:

1.Actual attainable baud rate will be 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.

3.Guaranteed by design.

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