M38001M2DXXXFP View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M38001M2DXXXFP

8-BIT SINGLE-CHIP MICROCOMPUTER

MITSUBISHI ELECTRIC  

APPENDIX

3.5 List of registers

Transmit/Receive buffer register

b7 b6 b5 b4 b3 b2 b1 b0

Transmit/Receive buffer register (TB/RB) [Address : 1816]

B

Function

0 A transmission data is written to or a receive data is read out

from this buffer register.

1

• At writing : a data is written to the Transmit buffer register.

• At reading : a content of the Receive buffer register is read out.

At reset R W

?

?

2

?

3

?

4

?

5

?

6

?

7

?

Note : A content of the Transmit buffer register cannot be read out.

A data cannot be written to the Receive buffer register.

Fig. 3.5.3 Structure of Transmit/Receive buffer register

Serial I/O status register

b7 b6 b5 b4 b3 b2 b1 b0

Serial I/O status reigster (SIOSTS) [Address : 1916]

B

Name

0

Transmit buffer empty flag

(TBE)

Function

0 : Buffer full

1 : Buffer empty

1 Receive buffer full flag (RBF) 0 : Buffer empty

1 : Buffer full

2

Transmit shift register shift

completion flag (TSC)

0 : Transmit shift in progress

1 : Transmit shift completed

3 Overrun error flag (OE)

4 Parity error flag (PE)

0 : No error

1 : Overrun error

0 : No error

1 : Parity error

5 Framing error flag (FE)

6 Summing error flag (SE)

0 : No error

1 : Framing error

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

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

7 Nothing is allocated for this bit. It is a write disabled bit.

When this bit is read out, the value is “0.”

At reset R W

0

!

0

!

0

!

0

!

0

!

0

!

0

!

1

!

Fig. 3.5.4 Structure of Serial I/O status register

3800 GROUP USER’S MANUAL

3-29

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