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Switching from SCK Pin Function to Port Pin Function:
• Problem in Operation: When switching the SCK pin function to the output port function (high-
level output) by making the following settings while DDR = 1, DR = 1, C/A = 1, CKE1 = 0,
CKE0 = 0, and TE = 1 (synchronous mode), low-level output occurs for one half-cycle.
1. End of serial data transmission
2. TE bit = 0
3. C/A bit = 0 ... switchover to port output
4. Occurrence of low-level output (see figure 12.23)
SCK/port
Data
Bit 6
TE
C/A
CKE1
CKE0
Figure 12.23 Operation when Switching from SCK Pin Function to Port Pin Function
1. End of transmission
Bit 7
2.TE= 0
Half-cycle low-level output
4. Low-level output
3.C/A= 0
369
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