Renesas H8S/2138 Series Handbuch Seite 123

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Microcomputer Technical Q&A
115
Q&A No.: QAH8S-236
Category: SCI
Subject: Use of RDR and TDR when SCI is Not Used
Questions
Can the following registers be used as data registers when the SCI is not used?
1. Receive data register (RDR)
2. Transmit data register (TDR)
Answers
1. No: as the receive data register (RDR) is a read-only register, it cannot be used as a data
register.
2. Yes, the transmit data register (TDR) can be used as a data register.
Applicable Products
Applicability Series Applicability Series Applicability Series
Yes Entire H8S Series H8S/2655 H8S/2350
H8S/2355 H8S/2357 H8S/2345
H8S/2245 H8S/2148 H8S/2144
H8S/2138 H8S/2134 H8S/2128
H8S/2124
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