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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 outputTE
4.C/A= 0
Rev. 4.00 Jan 26, 2006 page 539 of 938
5.CKE1= 0
REJ09B0276-0400
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