HD6432646 Hitachi, HD6432646 Datasheet - Page 530

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

Switching from SCK Pin Function to Port Pin Function:
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 13-27)
496
SCK/port
Data
TE
C/A
CKE1
CKE0
Figure 13-27 Operation when 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.
Bit 6
Bit 7
1. End of transmission
2. TE = 0
3. C/A = 0
4. Low-level output
Half-cycle low-level output