Hardware manual

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

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 — — — —