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SCK/port
Data
Bit 6
TE
C/A
CKE1
CKE0
Figure 13.31 Operation when Switching from SCK Pin Function to Port Pin Function
Sample Procedure for Avoiding Low-Level Output: As this sample procedure temporarily
places the SCK pin in the input state, the SCK/port pin should be pulled up beforehand with an
external circuit.
With DDR = 1, DR = 1, C/A = 1, CKE1 = 0, CKE0 = 0, and TE = 1, make the following
settings in the order shown.
1. End of serial data transmission
2. TE bit = 0
3. CKE1 bit = 1
4. C/A bit = 0 ... switchover to port output
5. CKE1 bit = 0
Rev. 3.0, 10/02, page 414 of 686
1. End of transmission
Bit 7
2.TE= 0
Half-cycle low-level output
4. Low-level output
3.C/A= 0
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