HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 514

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 12 Serial Communication Interface (SCI)
Rev.3.00 Mar. 26, 2007 Page 472 of 772
REJ09B0355-0300
Figure 12.28 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
5. CKE1 bit = 0
SCK/port
Data
TE
C/A
CKE1
CKE0
Bit 6
Switchover to port output
(Example of Preventing Low-Level Output)
Bit 7
1. End of transmission
2. TE = 0
3. CKE1 = 1
4. C/A = 0
High-level output
5. CKE1 = 0