M16CSLASH26 datasheet(127/239 Pages) RENESAS

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Clock Synchronous Serial I/O Mode

121

Renesas Technology Corp.

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.

Table 1.15.4. Registers used in clock synchronous serial I/O mode and the register values set

Bit

Function

UiTB(Note3)

0 to 7

Set transmission data

UiRB(Note3) 0 to 7

Reception data can be read

OER

Overrun error flag

UiBRG

0 to 7

Set a transfer rate

UiMR(Note3) SMD2 to SMD0

Set to “0012”

CKDIR

Select the internal clock or external clock

IOPOL

Set to “0”

UiC0

CLK1 to CLK0

Select the count source for the UiBRG register

CRS

Select CTS or RTS to use

TXEPT

Transmit register empty flag

CRD

Enable or disable the CTS or RTS function

NCH

Select TxDi pin output mode (Note 2)

CKPOL

Select the transfer clock polarity

UFORM

Select the LSB first or MSB first

UiC1

Set this bit to “1” to enable transmission/reception

Transmit buffer empty flag

Set this bit to “1” to enable reception

Reception complete flag

U2IRS (Note 1)

Select the source of UART2 transmit interrupt

U2RRM (Note 1)

Set this bit to “1” to use continuous receive mode

UiLCH

Set this bit to “1” to use inverted data logic

UiERE

Set to “0”

UiSMR

0 to 7

Set to “0”

UiSMR2

0 to 7

Set to “0”

UiSMR3

0 to 2

Set to “0”

NODC

Select clock output mode

4 to 7

Set to “0”

UiSMR4

0 to 7

Set to “0”

UCON

U0IRS, U1IRS

Select the source of UART0/UART1 transmit interrupt

U0RRM, U1RRM

Set this bit to “1” to use continuous receive mode

CLKMD0

Select the transfer clock output pin when CLKMD1 = 1

CLKMD1

Set this bit to “1” to output UART1 transfer clock from two pins

RCSP

Set this bit to “1” to accept as input the UART0 CTS0 signal from the P64 pin

Set to “0”

Note 1: Set the U0C1 and U1C1 register bit 4 and bit 5 to “0”. The U0IRS, U1IRS, U0RRM and U1RRM bits

are in the UCON register.

Note 2: TxD2 pin is N channel open-drain output. Set the U2C0 register's NCH bit to “0”.

Note 3: Not all register bits are described above. Set those bits to “0” when writing to the registers in clock

synchronous serial I/O mode.

i=0 to 2

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