MPC8535E datasheet(39/126 Pages) FREESCALE

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DUART

MPC8535E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 3

Freescale Semiconductor

2.8

DUART

This section describes the DC and AC electrical specifications for the DUART interface of the MPC8535E.

2.8.1

DUART DC Electrical Characteristics

Table 22 provides the DC electrical characteristics for the DUART interface.

2.8.2

DUART AC Electrical Specifications

Table 23 provides the AC timing parameters for the DUART interface.

2.9

Ethernet: Enhanced Three-Speed Ethernet (eTSEC),

MII Management

This section provides the AC and DC electrical characteristics for enhanced three-speed and MII management.

Table 22. 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 = –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 23. DUART AC Timing Specifications

Parameter

Value

Unit

Notes

Minimum baud rate

CCB clock/1,048,576

baud

Maximum baud rate

CCB clock/16

baud

2,3

Oversample rate

—

Notes:

2. CCB clock refers to the platform clock.

3. Actual attainable baud rate will be 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.

MPC8535E 数据表(PDF) 39 Page - Freescale Semiconductor, Inc

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