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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
SCK/port
Data
Bit 6
TE
C/A
CKE1
CKE0
Figure 13.24 Operation when Switching from SCK Pin Function to Port Pin Function
1. End of transmission
Bit 7
2. TE = 0
3. CKE1 = 1
(Example of Preventing Low-Level Output)
Section 13 Serial Communication Interface
High-level output
4. C/A = 0
Rev. 3.00 Mar 21, 2006 page 493 of 814
5. CKE1 = 0
REJ09B0302-0300
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