M30620FCAFP datasheet(383/615 Pages) RENESAS

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Clock-Synchronous Serial I/O

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-66

Internal/external clock select bit

0 : Internal clock

Setting UART1 transmit/receive mode register

UART1 transmit/receive mode register [Address 03A816]

U1MR

Invalid in clock synchronous I/O mode

Must be fixed to “001”

Invalid in clock synchronous I/O mode

Sleep select bit

Must always be “0” in clock synchronous I/O mode

Setting UART1 transmit/receive control register 0

UART1 transmit/receive control register 0 [Address 03AC16]

U1C0

CLK polarity select bit

0 : Transmission data is output at falling edge of transfer clock and

reception data is input at rising edge

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

Valid when bit 4 = “0”

Data output select bit

0 : TXDi pin is CMOS output

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

CTS/RTS disable bit

1 : CTS/RTS function disabled

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

Continued to the next page

Setting UART transmit/receive control register 2

UART transmit/receive control register 2 [Address 03B016]

UCON

CLK/CLKS select bit 1

1 : Transfer clock output from multiple pins function selected

UART0 transmit interrupt cause select bit

1 : Transmission completed (TXEPT = 1)

CLK/CLKS select bit 0

0 : Clock output to CLK1

1 : Clock output to CLKS1

Reserved bit

Must always be set to “0”

Figure 2.4.11. Set-up procedure of transmission in clock-synchronous serial I/O mode, transfer

clock output from multiple pins function selected (1)

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