Renesas H8S/2633 Series Hardware Manual page 819

Switching from SCK Pin Function to Port Pin Function:
• Problem in Operation: When switching the SCK pin to the output function while DDR and DR
are set to 1 and clock synchronous SCI clock output is being used, low-level output occurs for
one half-cycle, followed by port output.
When switching to the port function by making the following settings while DDR, DR, and
C/A are set to 1 and CKE1, CKE0, and TE are set to 0, low-level output occurs for one half-
cycle.
1. End of serial data transmission
2. TE bit = 0
3. C/A bit = 0 ... switchover to port output
4. Occurrence of low-level output (see figure 16-29)
SCK/port
Bit 6
Data
TE
C/A
CKE1
CKE0
Figure 16-29 Operation when Switching from SCK Pin Function to Port Pin Function
1. End of transmission
Bit 7
2.TE= 0
Half-cycle low-level output
4. Low-level output
3.C/A = 0
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