Epson S1C33L03 User Manual

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

0x0 to 0xFF(0x7F)

D7

D6

D5

D4

D3

D2

D1

D0

Serial I/F Ch.0 transmit data 

TXD07(06) = MSB

TXD00 = LSB

X

X

X

X

X

X

X

X

R/W 7-bit asynchronous 

mode does not use 

TXD07.

0x0 to 0xFF(0x7F)

D7

D6

D5

D4

D3

D2

D1

D0

Serial I/F Ch.0 receive data 

RXD07(06) = MSB

RXD00 = LSB

X

X

X

X

X

X

X

X

R

7-bit asynchronous 

mode does not use 

RXD07 (fixed at 0).

D7–6

D5

D4

D3

D2

D1

D0

–

Ch.0 transmit-completion flag

Ch.0 flaming error flag

Ch.0 parity error flag

Ch.0 overrun error flag

Ch.0 transmit data buffer empty

Ch.0 receive data buffer full

–

0

0

0

0

1

0

–

R

R/W

R/W

R/W

R

R

0 when being read.

Reset by writing 0.

Reset by writing 0.

Reset by writing 0.

–

1 Error

0 Normal

1 Transmitting 0 End

1 Error

0 Normal

1 Error

0 Normal

1 Empty

0 Buffer full

1 Buffer full

0 Empty

D7

D6

D5

D4

D3

D2

D1

D0

Ch.0 transmit enable

Ch.0 receive enable

Ch.0 parity enable

Ch.0 parity mode selection

Ch.0 stop bit selection

Ch.0 input clock selection

Ch.0 transfer mode selection

1

1

0

0

1

0

1

0

SMD0[1:0]

Transfer mode

8-bit asynchronous

7-bit asynchronous

Clock sync. Slave

Clock sync. Master

0

0

X

X

X

X

X

X

R/W

R/W

R/W

R/W

R/W

R/W

R/W

Valid only in 

asynchronous mode.

1 Enabled

0 Disabled

1 Enabled

0 Disabled

1 With parity

0 No parity

1 Odd

0 Even

1 2 bits

0 1 bit

1 #SCLK0

0 Internal clock

D7–5

D4

D3

D2

D1

D0

–

Ch.0 async. clock division ratio

Ch.0 IrDA I/F output logic inversion

Ch.0 IrDA I/F input logic inversion

Ch.0 interface mode selection

1

1

0

0

1

0

1

0

IRMD0[1:0]

–

I/F mode

reserved

IrDA 1.0

reserved

General I/F

–

X

X

X

X

X

–

R/W

R/W

R/W

R/W

0 when being read.

Valid only in 

asynchronous mode.

1 1/8

0 1/16

1 Inverted

0 Direct

1 Inverted

0 Direct

0x0 to 0xFF(0x7F)

D7

D6

D5

D4

D3

D2

D1

D0

Serial I/F Ch.1 transmit data 

TXD17(16) = MSB

TXD10 = LSB

X

X

X

X

X

X

X

X

R/W 7-bit asynchronous 

mode does not use 

TXD17.

0x0 to 0xFF(0x7F)

D7

D6

D5

D4

D3

D2

D1

D0

Serial I/F Ch.1 receive data 

RXD17(16) = MSB

RXD10 = LSB

X

X

X

X

X

X

X

X

R

7-bit asynchronous 

mode does not use 

RXD17 (fixed at 0).