HD6413007F20 Datasheet, PDF (515/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

SCK
t
TDRE
13. Serial Communication Interface
D0
D1
D2
D3
D4
D5
D6
D7
Note: In operation with an external clock source, be sure that t >4 states.
Figure 13.22 Example of Synchronous Transmission Using DMAC
Switching from SCK Pin Function to Port Pin Function:
• Problem in Operation: When switching the SCK pin function to the output port function (high-
level output) by making the following settings while DDR = 1, DR = 1, C/A = 1, CKE1 = 0,
CKE0 = 0, and TE = 1 (synchronous mode), 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 13.23)
Half-cycle low-level output
SCK/port
Data
Bit 6
TE
C/A
1. End of transmission
Bit 7
2. TE = 0
4. Low-level output
3.C/A = 0
CKE1
CKE0
Figure 13.23 Operation when Switching from SCK Pin Function to Port Pin Function
Rev.5.00 Sep. 12, 2007 Page 485 of 764
REJ09B0396-0500