M30620FCAFP datasheet(403/615 Pages) RENESAS

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UART

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-86

Figure 2.5.9. Set-up procedure of transmission in UART mode (1)

Continued to the next page

Stop bit length select bit

0 : One stop bit

Parity enable bit

1 : Parity enabled

Setting UARTi transmit/receive mode register (i=0 to 2)

Internal/external clock select bit

0 : Internal clock

Stop bit length select bit

0 : One stop bit

Odd/even parity select bit (Valid when bit 6 = “1”)

0 : Odd parity

Parity enable bit

1 : Parity enabled

Sleep select bit

0 : Invalid

Serial I/O mode select bit

1 0 1 : Transfer data 8 bits long

b2 b1 b0

UART0 transmit/receive mode register

U0MR [Address 03A016]

UART1 transmit/receive mode register

U1MR [Address 03A816]

Must always be “0” in UART mode

Odd/even parity select bit (Valid when bit 6 = “1”)

0 : Odd parity

TXD, RXD I/O polarity reverse bit

Usually set to “0”

Serial I/O mode select bit

1 0 1 : Transfer data 8 bits long

b2 b1 b0

UART2 transmit/receive mode register

U2MR [Address 037816]

Setting UARTi transmit/receive control register 0 (i = 0 to 2)

UART0 transmit/receive control register 0

U0C0 [Address 03A416]

UART1 transmit/receive control register 0

U1C0 [Address 03AC16]

Must always be “0” in UART mode

BRG count source select bit

0 0 : f1 is selected

0 1 : f8 is selected

1 0 : f32 is selected

1 1 : Must not be set

b1 b0

CTS/RTS function select bit (Valid when bit 4 = “0”)

0 : CTS function is selected

Data output select bit

0 : TxDi pin is CMOS output

1 : TxDi pin is N-channel open-drain output

CTS/RTS disable bit

0 : CTS/RTS function enabled

Transmit register empty flag

0 : Data present in transmit register

(during transmission)

1 : No data present in transmit register

(transmission completed)

Must always be “0” in UART mode

UART2 transmit/receive control register 0

U2C0 [Address 037C16]

Must always be “0” in UART mode

BRG count source select bit

0 0 : f1 is selected

0 1 : f8 is selected

1 0 : f32 is selected

1 1 : Must not be set

b1 b0

CTS/RTS function select bit (Valid when bit 4 = “0”)

0 : CTS function is selected

CTS/RTS disable bit

0 : CTS/RTS function enabled

Transmit register empty flag

0 : Data present in transmit register

(during transmission)

1 : No data present in transmit register

(transmission completed)

Transfer format select bit

0 : LSB first

Setting UART transmit/receive control register 2 and UART2 transmit/receive control register 1

UART2transmit/receive control register 1

UCON [Address 037D16]

UART0 transmit interrupt cause select bit

1 : Transmission completed (TXEPT = 1)

Data logic select bit

0 : No reverse

Error signal output enable bit

0 : output enabled

Must always be “0” in UART mode

UART transmit/receive control register 2

UCON [Address 03B016]

UART0 transmit interrupt cause select bit

1 : Transmission completed (TXEPT = 1)

UART1 transmit interrupt cause select bit

1 : Transmission completed (TXEPT = 1)

Reserved bit

Must always be set to “0”

Stop bit length select bit

0 : One stop bit

Parity enable bit

1 : Parity enabled

Must always be “0” in UART mode

Invalid in UART mode

Must always be “0” in UART mode

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