MC68HC05E0 Datasheet, PDF(83/96 Page) Motorola, Inc – High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit

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MC68HC05E0 Datasheet, PDF (83/96 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit

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9.6

Serial Interface Timing

DATA

Hi-Z

Idle

START Bit

(Transmit only)

tSTART

CLOCK

Clock Idle Start

MSB

(Bit 7)

tVALID

1st Clock

MSB â1

(Bit 6)

2nd Clock

tHOLD

Sample Data

tHOLD

Sample Data

tHOLD = 1 Bus Cycle Time + t pd

(tpd â 0 â 30 ns)

tSTART = tVALID = 1/SPI Transfer Frequency (SPI Transfer Frequency determined by BD0/BD1)

Figure 9-4 SPI Timing Diagram

SDA

MSB

tVALID

MSBâ1

SCL

tSTART

tHOLD

tHOLD = 1 Bus Cycle Time + t pd

tSTART = t VALID = 1 / I 2C Transfer Frequency

(tpd â 0 â 30 ns)

(I2C Transfer Frequency determined by BD0/BD1)

Figure 9-5 I2C-bus Timing Diagram

MC68HC05E0

ELECTRICAL SPECIFICATIONS

MOTOROLA

9-7

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