H8S2245 datasheet(514/818 Pages) RENESAS

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H8S2245 데이터시트(PDF) 514 Page - Renesas Technology Corp

부품명	H8S2245

상세설명	Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series

PDF	818 Pages

Scroll/Zoom	100%

제조업체	RENESAS [Renesas Technology Corp]

홈페이지	http://www.renesas.com

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514 / 818 page

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.

End of serial data transmission

TE bit = 0

CKE1 bit = 1

A bit = 0… Switchover to port output

CKE1 bit = 0

SCK/port

Data

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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