H8S15 Datasheet, PDF (524/904 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

Section 13 Serial Communication Interface
H8S/2215 Group
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 13.45 Operation when Switching from SCK Pin Function to Port Pin Function
(Example of Preventing Low-Level Output)
13.10.7 Module Stop Mode Setting
Operation of the SCI can be disabled or enabled using the module stop control register. The initial
setting is for operation of the SCI to be halted. Register access is enabled by clearing module stop
mode. For details, refer to section 22, Power-Down Modes.
Page 470 of 846
REJ09B0140-0900 Rev. 9.00
Sep 16, 2010