III PERIPHERAL BLOCK: SERIAL INTERFACE

I/O Memory of Serial Interface

Table 8.14 shows the control bits of the serial interface.

For details on the I/O memory of the prescaler that is used to set clocks, as well of that of 8-bit programmable timers, refer to "Prescaler" and "8-Bit Programmable Timers", respectively.

Table 8.14 Control Bits of Serial Interface

Register name

Address

Bit

Name

Function

 

 

 

 

Setting

Init.

R/W

Remarks

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Serial I/F Ch.0

00401E0

D7

TXD07

Serial I/F Ch.0 transmit data

 

 

 

0x0 to 0xFF(0x7F)

X

R/W

7-bit asynchronous

transmit data

(B)

D6

TXD06

TXD07(06) = MSB

 

 

 

 

 

 

 

 

 

 

X

 

mode does not use

register

 

D5

TXD05

TXD00 = LSB

 

 

 

 

 

 

 

 

 

 

X

 

TXD07.

 

 

D4

TXD04

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

D3

TXD03

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

D2

TXD02

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

D1

TXD01

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

D0

TXD00

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Serial I/F Ch.0

00401E1

D7

RXD07

Serial I/F Ch.0 receive data

 

 

 

0x0 to 0xFF(0x7F)

X

R

7-bit asynchronous

receive data

(B)

D6

RXD06

RXD07(06) = MSB

 

 

 

 

 

 

 

 

 

 

X

 

mode does not use

register

 

D5

RXD05

RXD00 = LSB

 

 

 

 

 

 

 

 

 

 

X

 

RXD07 (fixed at 0).

 

 

D4

RXD04

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

D3

RXD03

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

D2

RXD02

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

D1

RXD01

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

D0

RXD00

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Serial I/F Ch.0

00401E2

D7–6

–

–

 

 

 

 

 

 

–

 

 

–

–

0 when being read.

status register

(B)

D5

TEND0

Ch.0 transmit-completion flag

1

 

Transmitting

 

0

 

End

0

R

 

 

 

D4

FER0

Ch.0 flaming error flag

1

 

Error

 

 

 

0

 

Normal

0

R/W

Reset by writing 0.

 

 

D3

PER0

Ch.0 parity error flag

1

 

Error

 

 

 

0

 

Normal

0

R/W

Reset by writing 0.

 

 

D2

OER0

Ch.0 overrun error flag

1

 

Error

 

 

 

0

 

Normal

0

R/W

Reset by writing 0.

 

 

D1

TDBE0

Ch.0 transmit data buffer empty

1

 

Empty

 

 

0

 

Buffer full

1

R

 

 

 

D0

RDBF0

Ch.0 receive data buffer full

1

 

Buffer full

 

 

0

 

Empty

0

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Serial I/F Ch.0

00401E3

D7

TXEN0

Ch.0 transmit enable

1

 

Enabled

 

 

0

 

Disabled

0

R/W

 

control register

(B)

D6

RXEN0

Ch.0 receive enable

1

 

Enabled

 

 

0

 

Disabled

0

R/W

 

 

 

D5

EPR0

Ch.0 parity enable

1

 

With parity

 

0

 

No parity

X

R/W

Valid only in

 

 

D4

PMD0

Ch.0 parity mode selection

1

 

Odd

 

 

 

0

 

Even

X

R/W

asynchronous mode.

 

 

D3

STPB0

Ch.0 stop bit selection

1

 

2 bits

 

 

 

0

 

1 bit

X

R/W

 

 

 

D2

SSCK0

Ch.0 input clock selection

1

 

#SCLK0

 

 

0

 

Internal clock

X

R/W

 

 

 

D1

SMD01

Ch.0 transfer mode selection

SMD0[1:0]

 

Transfer mode

X

R/W

 

 

 

D0

SMD00

 

 

1

 

1

8-bit asynchronous

X

 

 

 

 

 

 

 

 

1

 

0

7-bit asynchronous

 

 

 

 

 

 

 

 

 

0

 

1

Clock sync. Slave

 

 

 

 

 

 

 

 

 

0

 

0

Clock sync. Master

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Serial I/F Ch.0

00401E4

D7–5

–

–

 

 

 

 

 

 

–

 

 

–

–

0 when being read.

IrDA register

(B)

D4

DIVMD0

Ch.0 async. clock division ratio

1

 

1/8

 

 

 

0

 

1/16

X

R/W

 

 

 

D3

IRTL0

Ch.0 IrDA I/F output logic inversion

1

 

Inverted

 

 

0

 

Direct

X

R/W

Valid only in

 

 

D2

IRRL0

Ch.0 IrDA I/F input logic inversion

1

 

Inverted

 

 

0

 

Direct

X

R/W

asynchronous mode.

 

 

D1

IRMD01

Ch.0 interface mode selection

IRMD0[1:0]

 

 

 

I/F mode

X

R/W

 

 

 

D0

IRMD00

 

 

1

 

1

 

 

 

reserved

X

 

 

 

 

 

 

 

 

1

 

0

 

 

 

IrDA 1.0

 

 

 

 

 

 

 

 

 

0

 

1

 

 

 

reserved

 

 

 

 

 

 

 

 

 

0

 

0

 

 

General I/F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Serial I/F Ch.1

00401E5

D7

TXD17

Serial I/F Ch.1 transmit data

 

 

 

0x0 to 0xFF(0x7F)

X

R/W

7-bit asynchronous

transmit data

(B)

D6

TXD16

TXD17(16) = MSB

 

 

 

 

 

 

 

 

 

 

X

 

mode does not use

register

 

D5

TXD15

TXD10 = LSB

 

 

 

 

 

 

 

 

 

 

X

 

TXD17.

 

 

D4

TXD14

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

D3

TXD13

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

D2

TXD12

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

D1

TXD11

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

D0

TXD10

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Serial I/F Ch.1

00401E6

D7

RXD17

Serial I/F Ch.1 receive data

 

 

 

0x0 to 0xFF(0x7F)

X

R

7-bit asynchronous

receive data

(B)

D6

RXD16

RXD17(16) = MSB

 

 

 

 

 

 

 

 

 

 

X

 

mode does not use

register

 

D5

RXD15

RXD10 = LSB

 

 

 

 

 

 

 

 

 

 

X

 

RXD17 (fixed at 0).

 

 

D4

RXD14

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

D3

RXD13

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

D2

RXD12

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

D1

RXD11

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

D0

RXD10

 

 

 

 

 

 

 

 

 

 

 

X

 

 

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