M16CSLASH26 datasheet(120/239 Pages) RENESAS

120 / 239 page

Renesas Technology Corp.

Serial I/O

114

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Figure 1.15.6. Serial I/O-related registers (3)

UART2 transmit/receive mode register

Symbol

Address

When reset

U2MR

0378 16

0016

Bit name

Bit

symbol

CKDIR

SMD1

SMD0

Serial I/O mode select bit

SMD2

Internal/external clock

select bit

STPS

PRY

PRYE

IOPOL

Parity enable bit

0 : Internal clock

1 : External clock (Note 1)

Stop bit length select bit

Odd/even parity select bit

TxD, RxD I/O polarity

reverse bit

0 : One stop bit

1 : Two stop bits

0 : Parity disabled

1 : Parity enabled

0 : No reverse

1 : Reverse

Usually set to 0

0 0 0 : Serial I/O invalid

0 0 1 : Serial I/O

0 1 0 : I2C mode

0 1 1 :

Must not be set

1 1 1 :

b2 b1 b0

0 0 0 : Serial I/O invalid

1 0 0 : Transfer data 7 bits long

1 0 1 : Transfer data 8 bits long

1 1 0 : Transfer data 9 bits long

Except the above : Must not be set

b2 b1 b0

Invalid

Valid when bit 6 = 1

0 : Odd parity

1 : Even parity

Invalid

0 : No reverse

1 : Reverse

Usually set to 0

Function

(During UART mode)

Function

(During clock synchronous

serial I/O mode)

0 : Internal clock

1 : External clock (Note 1)

UART2 transmit/receive control register 0

Symbol

Address

When reset

U2C0

037C 16

0816

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 : f1SIO or f2SIO is selected

(Note 2)

0 1 : f8SIO is selected

1 0 : f32SIO is selected

1 1 : Must not be set.

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

(P60, P64 and P73 function

as programmable I/O port

UFORM Transfer format select bit

(Note 4)

0 0 : f1SIO or f2SIO is selected

(Note 2)

0 1 : f8SIO is selected

1 0 : f32SIO is selected

1 1 : Must not be set.

b1 b0

Valid when bit 4 = "0"

0 : CTS function is selected (Note 1)

1 : RTS function is selected (Note 3)

Valid when bit 4 = "0"

0 : CTS function is selected (Note 1)

1 : RTS function is selected (Note 3)

0 : Data present in transmit register

(during transmission)

1 : No data present in transmit

Must always be "0"

Bit name

Bit

symbol

Note 1: Set the corresponding port direction register to "0".

Note 3: The settings of the corresponding port register and port direction register are invalid.

Note 4: Only clock synchronous serial I/O mode and 8-bit UART mode are valid.

0 : CTS/RTS function enabled

1 : CTS/RTS function disabled

(P60, P64 and P73 function

as 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”.

Note 2: Periperal clock select register bit PCLK1 is used to select between f1SIO and f2SIO.

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