COP8AME9 Datasheet, PDF (66/83 Pages) National Semiconductor (TI) – 8-Bit CMOS Flash Microcontroller with 8k Memory, Dual Op Amps, Virtual EEROM, Temperature Sensor,10-Bit A/D and Brownout Reset

20.0 MICROWIRE/PLUS (Continued)
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 39. MICROWIRE/PLUS Shift Clock Polarity and Sample/Shift Phase
SK Phase
Normal
Alternate
Alternate
Normal
Port G
G6 (SKSEL)
Config. Bit
G5 Data
Bit
0
0
1
0
0
1
1
1
SO Clocked Out On:
SK Falling Edge
SK Rising Edge
SK Rising Edge
SK Falling Edge
SI Sampled On:
SK Rising Edge
SK Falling Edge
SK Falling Edge
SK Rising Edge
SK Idle Phase
Low
Low
High
High
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FIGURE 35. MICROWIRE/PLUS SPI Mode Interface Timing, Normal SK Mode, SK Idle Phase being Low
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FIGURE 36. MICROWIRE/PLUS SPI Mode Interface Timing, Alternate SK Mode, SK Idle Phase being Low
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FIGURE 37. MICROWIRE/PLUS SPI Mode Interface Timing, Normal SK Mode, SK Idle Phase being High
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