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H8S/2218 Scheda tecnica(PDF) 496 Page - Renesas Technology Corp

Il numero della parte H8S/2218
Spiegazioni elettronici  16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series
PDF  750 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8S/2218 Scheda tecnica(HTML) 496 Page - Renesas Technology Corp

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Section 12 Serial Communication Interface
Rev.6.00 Jun. 03, 2008 Page 448 of 698
REJ09B0074-0600
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
Bit 7
Bit 6
1. End of transmission
3.CKE1= 1
5.CKE1= 0
4.C/A= 0
2.TE= 0
High-level output
SCK/port
Data
TE
C/
A
CKE1
CKE0
Figure 12.44 Operation when Switching from SCK Pin Function to Port Pin Function
(Example of Preventing Low-Level Output)



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