Datasheet

Section 12 Serial Communication Interface

Rev.7.00 Dec. 24, 2008 Page 447 of 698

REJ09B0074-0700

12.10.7 Switching from SCK Pin Function to Port Pin Function:

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 12.43)

Bit 7Bit 6

1. End of transmission 4. Low-level output

3.C/A= 0

2.TE= 0

Half-cycle low-level output

SCK/port

Data

C/A

CKE1

CKE0

Figure 12.43 Operation when Switching from SCK Pin Function to Port Pin Function