HD6432621 Hitachi, HD6432621 Datasheet - Page 529

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

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
SCK/port
Data
TE
C/A
CKE1
CKE0
Figure 13-28 Operation when Switching from SCK Pin Function to Port Pin Function
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.
Bit 6
Bit 7
(Example of Preventing Low-Level Output)
1. End of transmission
2. TE = 0
3. CKE1 = 1
4. C/A = 0
High-level output
5. CKE1 = 0
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