32186 datasheet(568/1032 Pages) RENESAS

568 / 1032 page

SERIAL INTERFACE

12-20

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

12.2.5 SIO Receive Buffer Registers

SIO0 Receive Buffer Register (S0RXB)

<Address: H'0080 0114>

SIO1 Receive Buffer Register (S1RXB)

<Address: H'0080 0124>

SIO2 Receive Buffer Register (S2RXB)

<Address: H'0080 0134>

SIO3 Receive Buffer Register (S3RXB)

<Address: H'0080 0144>

SIO4 Receive Buffer Register (S4RXB)

<Address: H'0080 0A14>

SIO5 Receive Buffer Register (S5RXB)

<Address: H'0080 0A24>

b15

RDATA

????????????????

Bit Name

Function

0–15

RDATA

Received data is stored in these bits.

–

Received data

The SIO Receive Buffer Registers are used to store the received data. When the serial interface has

finished receiving data, the content of the SIO Receive Shift Register is transferred to the SIO Receive

Buffer Register. These registers are a read-only register.

Data must be LSB-aligned when latching a received data.

According to the conditions of the serial interface mode select bit, the CSIO bit length select bit and the

transfer order select bit, the data corresponding to the specified bit is received from the LSB or MSB side

and an unused MSB side bit is set to “0.”

When reading the content of the SIO Receive Buffer Register after reception is completed, if the serial

interface finishes receiving the next data before the previous data is not read out, an overrun error occurs

and the subsequent received data are not transferred to the Receive Buffer Register.

To restart normal receive operation, clear the Receive Control Register REN (Receive Enable) bit to "0."

Note: • For the 7-bit and 8-bit data formats, the register can be accessed bytewise.

12.2 Serial Interface Related Registers

32186 Datasheet(PDF) 568 Page - Renesas Technology Corp