HD6413008VF25 Datasheet, PDF (428/688 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

12. Serial Communication Interface
• 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
High-level outputTE
SCK/port
Data
Bit 6
TE
C/A
CKE1
1. End of transmission
Bit 7
2.TE = 0
3.CKE1 = 1
4.C/A = 0
5.CKE1 = 0
CKE0
Figure 12.24 Operation when Switching from SCK Pin Function to Port Pin Function
(Example of Preventing Low-Level Output)
Rev.4.00 Aug. 20, 2007 Page 382 of 638
REJ09B0395-0400