MC68340 datasheet(422/441 Pages) FREESCALE

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11-22

MC68340 USER’S MANUAL

MOTOROLA

11.10 SERIAL MODULE ELECTRICAL SPECIFICATIONS (See notes (a), (b), (c), and

(d) corresponding to part operation, GND = 0 Vdc, TA = 0 to 70

°C; see numbered notes; see Figures 11-15–11-18)

3.3 V

3.3 V or

5.0 V

8.39 MHz

16.78 MHz

25.16 MHz

Num.

Characteristic

Symbol

Min

Max

Min

Max

Min

Max

Unit

CLKOUT Cycle Time

tcyc

119.2

—

59.6

—

Clock Rise or Fall Time

trf

—20

—10

—

Clock Input (X1 or SCLK ) Synchronizer Setup

Time

tCS

—

8, 5

—

Clock Input (X1 or SCLK ) Synchronizer Hold

Time

tCH

—

TxD Data Valid from CLKOUT High

tVLD

0.5 t cyc

Max

X1 Cycle Time

tX1

2.25 t cyc

Min

X1 High or Low Time

tX1HL

0.55 t cyc + 0.75(tCS + tCH)

Min

SCLK High or Low Time, Asynchronous (16x)

Mode

tAHL

tcyc + tCS + tCH

Min

SCLK High Time, Synchronous (1x) Mode

tSH

tcyc(Gx) + tCS(Gx) + tCH(Gx)

Min

SCLK Low Time, Synchronous (1x) Mode

tSL

greater of

({1.5tcyc(Tx) + tCS(Tx) + tVLD(Tx)} +

0.5tcyc(Rx) + tCS(Rx) + tCH(Rx)})

tSH

Min

TxD Data Valid from SCLK Low, Synchronous

(1x) Mode

× D

1.5tcyc(Tx) +

tCS(Tx) + tVLD(Tx)

Max

RxD Setup Time to SCLK High, Synchronous

(1x) Mode

× S

0.5tcyc(Rx) + tCS(Rx) + tCH(Rx)

Min

RxD Hold Time from SCLK High, Synchronous

(1x) Mode

× H

0.5tcyc(Rx) + tCS(Rx) + tCH(Rx)

Min

NOTES:

(a) The electrical specifications in this document for both the 8.39 and 16.78 MHz @ 3.3 V

±0.3 V are preliminary

and apply only to the appropriate MC68340V low voltage part.

(b) The 16.78-MHz specifications apply to the MC68340 @ 5.0 V

±5% operation.

±5% electrical specifications are preliminary.

(d) For extended temperature parts T A = –40 to +85°C. These specifications are preliminary.

Asynchronous operation numbers take into account a receiver and transmitter operating at different clock

frequencies. (Rx) refers to receiver value. (Tx) refers to transmitter value. (Gx) refers to the value that is greater,

either receiver or transmitter.

Specification #3 for 16.78 MHz @ 3.3 V

±0.3 V will be 8 ns.

CLKOUT

TxD

Figure 11-15. Serial Module General Timing Diagram

Freescale Semiconductor, Inc.

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