M306V2EEFS datasheet(106/271 Pages) RENESAS

106 / 271 page

Rev.1.40

Oct 06, 2004 page 106 of 269

M306V2ME-XXXFP, M306V2EEFP

Figure 2.11.10 UART2 transmit/receive control register 0

UART2 transmit/receive control register 0

Symbol

Address

When reset

U2C0

037C16

0816

b7b6b5b4

b3b2b1b0

Function

(During UART mode)

Function

(During clock synchronous

serial I/O mode)

TXEPT

CLK1

CLK0

CRS

CRD

CKPOL

BRG count source

select bit

Transmit register empty

flag

0 : Transmit data is output at

falling edge of transfer clock

and receive data is input at

rising edge

1 : Transmit data is output at

rising edge of transfer clock

and receive data is input at

falling edge

CLK polarity select bit

CTS/RTS function

select bit

CTS/RTS disable bit

0 0 : f1 is selected

0 1 : f8 is selected

1 0 : f32 is selected

1 1 : Inhibited

b1 b0

0 : LSB first

1 : MSB first

0 : Data present in transmit

1 : No data present in transmit

completed)

0 : CTS/RTS function enabled

1 : CTS/RTS function disabled

(P73 functions

programmable I/O port)

0 : TXDi pin is CMOS output

1 : TXDi pin is N-channel

open-drain output

UFORM Transfer format select bit

(Note 3)

0 0 : f1 is selected

0 1 : f8 is selected

1 0 : f32 is selected

1 1 : Inhibited

b1 b0

Valid when bit 4 = “0”

0 : CTS function is selected (Note 1)

1 : RTS function is selected (Note 2)

Valid when bit 4 = “0”

0 : CTS function is selected (Note 1)

1 : RTS function is selected (Note 2)

0 : Data present in transmit register

(during transmission)

1 : No data present in transmit

0: TXDi pin is CMOS output

1: TXDi pin is N-channel

open-drain output

Must always be set to “0”

Bit name

Bit

symbol

Notes 1: Set the corresponding port direction register to “0”.

2: The settings of the corresponding port register and port direction register are invalid.

3: Only clock synchronous serial I/O mode and 8-bit UART mode are valid.

0 : CTS/RTS function enabled

1 : CTS/RTS function disabled

(P73 functions programmable

I/O port)

0 : LSB first

1 : MSB first

Nothing is assigned.

In an attempt to write to this bit, write “0.” The value, if read, turns out to be “0.”

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