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H8S2245 Datasheet(PDF) 514 Page - Renesas Technology Corp

No. de pieza H8S2245
Descripción Electrónicos  Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
PDF  818 Pages
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Fabricante Electrónico  RENESAS [Renesas Technology Corp]
Página de inicio  http://www.renesas.com
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H8S2245 Datasheet(HTML) 514 Page - Renesas Technology Corp

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Section 12 Serial Communication Interface (SCI)
Rev.3.00 Mar. 26, 2007 Page 472 of 772
REJ09B0355-0300
• 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.
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
Bit 7
Bit 6
1. End of transmission
3. CKE1 = 1
5. CKE1 = 0
4. C/
A = 0
2. TE = 0
High-level output
Figure 12.28 Operation when Switching from SCK Pin Function to Port Pin Function
(Example of Preventing Low-Level Output)



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