MPC8544EBVTALJ datasheet(23/120 Pages) FREESCALE

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MPC8544E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 3

Freescale Semiconductor

DUART

7DUART

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

MPC8544E.

7.1

DUART DC Electrical Characteristics

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

7.2

DUART AC Electrical Specifications

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

Table 19. DUART DC Electrical Characteristics

Parameter

Symbol

Min

Max

Unit

Notes

High-level input voltage

VIH

2OVDD + 0.3

—

Low-level input voltage

VIL

–0.3

0.8

—

Input current (VIN = 0 V or VIN = VDD)IIN

—±5

μA1

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 20. DUART AC Timing Specifications

Parameter

Value

Unit

Notes

Minimum baud rate

CCB clock/1,048,576

baud

Maximum baud rate

CCB clock/16

baud

Oversample rate

—

Notes:

1. CCB clock refers to the platform clock.

2. Actual attainable baud rate will be limited by the latency of interrupt processing.

3. The middle of a start bit is detected as the eighth sampled 0 after the 1-to-0 transition of the start bit. Subsequent bit values

are sampled each sixteenth sample.

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