38K2 datasheet(190/358 Pages) RENESAS

190 / 358 page

2.4 Serial I/O

Rev.2.00

Oct 15, 2006

page 41 of 112

38K2 Group

REJ09B0338-0200

APPLICATION

Fig. 2.4.3 Structure of Serial I/O status register

Fig. 2.4.2 Structure of Transmit/Receive buffer register

2.4.2 Related registers

Transmit/Receive buffer register

b7 b6 b5 b4 b3 b2 b1 b0

Function

At reset

Name

Transmit/Receive buffer register (TB/RB) [Address : 2616]

The transmission data is written to or the receive data is read out

from this buffer register.

• At writing: A data is written to the transmit buffer register.

• At reading: The contents of the receive buffer register are read

out.

Note: The contents of transmit buffer register cannot be read out.

The data cannot be written to the receive buffer register.

Serial I/O status register

b7 b6 b5 b4 b3 b2 b1 b0

Function

At reset

Name

Serial I/O status register (SIOSTS) [Address : 2716]

Nothing is allocated for this bit. This is a write disabled bit.

When this bit is read out, the contents are “1”.

Transmit buffer empty flag

(TBE)

0 : (OE) U (PE) U (FE) = 0

1 : (OE) U (PE) U (FE) = 1

Overrun error flag (OE)

0 : Buffer full

1 : Buffer empty

Receive buffer full flag (RBF)

Transmit shift register shift

completion flag (TSC)

Parity error flag (PE)

Framing error flag (FE)

Summing error flag (SE)

0 : Buffer empty

1 : Buffer full

0 : Transmit shift in progress

1 : Transmit shift completed

0 : No error

1 : Overrun error

0 : No error

1 : Parity error

0 : No error

1 : Framing error

38K2 Datasheet(PDF) 190 Page - Renesas Technology Corp

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