HD6473032F16 Datasheet, PDF (523/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 13 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 output
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 13.24 Operation when Switching from SCK Pin Function to Port Pin Function
(Example of Preventing Low-Level Output)
Rev. 3.00 Mar 21, 2006 page 493 of 814
REJ09B0302-0300