COP8SCR9KMT7 datasheet(60/80 Pages) NSC

60 / 80 page

17.0 MICROWIRE/PLUS (Continued)

17.1.2.1 Alternate SK Phase Operation and SK Idle

Polarity

The device allows either the normal SK clock or an alternate

phase SK clock to shift data in and out of the SIO register. In

both the modes the SK idle polarity can be either high or low.

The polarity is selected by bit 5 of Port G data register. In the

normal mode data is shifted in on the rising edge of the SK

clock and the data is shifted out on the falling edge of the SK

clock. The SIO register is shifted on each falling edge of the

SK clock. In the alternate SK phase operation, data is shifted

in on the falling edge of the SK clock and shifted out on the

rising edge of the SK clock. Bit 6 of Port G configuration

A control flag, SKSEL, allows either the normal SK clock or

the alternate SK clock to be selected. Refer to Table 25 for

the appropriate setting of the SKSEL bit. The SKSEL is

mapped into the G6 configuration bit. The SKSEL flag will

power up in the reset condition, selecting the normal SK

signal provided the SK Idle Polarity remains LOW.

TABLE 25. MICROWIRE/PLUS Shift Clock Polarity and Sample/Shift Phase

Port G

SO Clocked Out On:

SI Sampled On:

SK Idle

Phase

SK Phase

G6 (SKSEL)

Config. Bit

G5 Data

Bit

Normal

SK Falling Edge

SK Rising Edge

Low

Alternate

SK Rising Edge

SK Falling Edge

Low

Alternate

SK Rising Edge

SK Falling Edge

High

Normal

SK Falling Edge

SK Rising Edge

High

10138935

FIGURE 29. MICROWIRE/PLUS Application

10138936

FIGURE 30. MICROWIRE/PLUS SPI Mode Interface Timing, Normal SK Mode, SK Idle Phase being Low

COP8SCR9KMT7 Datasheet(PDF) 60 Page - National Semiconductor (TI)

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