M38B53M4-059FP datasheet(131/355 Pages) MITSUBISHI

131 / 355 page

38B5 Group User’s Manual

APPLICATION

2-43

2.3 Serial I/O

Fig. 2.3.10 Structure of Serial I/O2 status register

Serial I/O2 status register

b7 b6 b5 b4 b3 b2 b1 b0

Serial I/O2 status register

(SIO2STS: address 1E16)

0: Buffer full

1: Buffer empty

Name

Functions

At reset R W

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

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

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

Transmit buffer

empty flag (TBE)

Receive buffer full

flag (RBF)

Overrun error flag

(OE)

Parity error flag

(PE)

Framing error flag

Summing error flag

Transmit shift

completion flag

(TSC)

Nothing is arranged for this bit. This is a write

disabled bit. When this bit is read out, the

contents are “1”.

(FE)

(SE)

Functions

At reset R W

Undefined

Serial I/O2 transmit/receive buffer register

b7 b6 b5 b4 b3 b2 b1 b0

Serial I/O2 transmit/receive buffer register

(TB/RB: address 1F16)

This is the buffer register which is used to write

transmit data or to read receive data.

• At write : The value is written to the transmit

buffer register. The value cannot be

written to the receive buffer register.

• At read : The contents of the receive buffer

character bit length is 7 bits, the

MSB of data stored in the receive

buffer is “0”. The contents of the

transmit buffer register cannot be

read out.

Fig. 2.3.11 Structure of Serial I/O2 transmit/receive buffer register

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