COP8CCR9IMT7SLASHNOPB datasheet(86/111 Pages) TI1

86 / 111 page

COP8CBR9, COP8CCR9, COP8CDR9

SNOS535I – OCTOBER 2000 – REVISED MARCH 2013

www.ti.com

The user must set the BUSY flag immediately upon entering the Slave mode. This ensures that all data

bits sent by the Master is shifted properly. After eight clock pulses the BUSY flag is clear, the shift clock is

stopped, and the sequence may be repeated.

Figure 5-26. MICROWIRE/PLUS Application

5.17.1.2.1 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 register selects the SK

edge.

A control flag, SKSEL, allows either the normal SK clock or the alternate SK clock to be selected. Refer to

Table 5-31 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 5-31. MICROWIRE/PLUS Shift Clock Polarity and Sample/Shift Phase

Port G

SK Phase

SO Clocked Out On:

SI Sampled On:

SK Idle Phase

G6 (SKSEL)

G5 Data Bit

Config. 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

Functional Description

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Product Folder Links: COP8CBR9 COP8CCR9 COP8CDR9

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