M30620FCAFP datasheet(372/615 Pages) RENESAS

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Clock-Synchronous Serial I/O

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-55

UARTi bit rate generator (Note 1, 2)

Symbol

Address

When reset

U0BRG

03A116

Indeterminate

U1BRG

03A916

Indeterminate

U2BRG

037916

Indeterminate

Function

Assuming that set value = n, BRGi divides the count source by

n + 1

0016 to FF16

Values that can be set

(b15)

(b8)

UARTi transmit buffer register (Note)

Function

Transmit data

Nothing is assigned.

In an attempt to write to these bits, write “0”. The value, if read, turns out to be indeterminate.

Symbol

Address

When reset

U0TB

03A316, 03A216

Indeterminate

U1TB

03AB16, 03AA16

Indeterminate

U2TB

037B16, 037A16

Indeterminate

(b15)

Symbol

Address

When reset

U0RB

03A716, 03A616

Indeterminate

U1RB

03AF16, 03AE16

Indeterminate

U2RB

037F16, 037E16

Indeterminate

(b8)

UARTi receive buffer register

Function

(During UART mode)

Function

(During clock synchronous

serial I/O mode)

Bit name

Bit

symbol

0 : No framing error

1 : Framing error found

0 : No parity error

1 : Parity error found

0 : No error

1 : Error found

Note 1: Bits 15 through 12 are set to “0” when the serial I/O mode select bit (bits 2 to 0 at addresses 03A016,

03A816 and 037816) are set to “0002” or the receive enable bit is set to “0”.

(Bit 15 is set to “0” when bits 14 to 12 all are set to “0”.) Bits 14 and 13 are also set to “0” when the

lower byte of the UARTi receive buffer register (addresses 03A616, 03AE16 and 037E16) is read out.

Note 2: Arbitration lost detecting flag is allocated to U2RB and noting but “0” may be written. Nothing is

assigned in bit 11 of U0RB and U1RB. When write, set “0”. The value, if read, turns out to be “0”.

Invalid

OER

FER

PER

SUM

Overrun error flag (Note 1)

Framing error flag (Note 1)

Parity error flag (Note 1)

Error sum flag (Note 1)

0 : No overrun error

1 : Overrun error found

0 : No overrun error

1 : Overrun error found

Nothing is assigned.

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

Receive data

ABT

Arbitration lost detecting

flag (Note 2)

Invalid

0 : Not detected

1 : Detected

Note 1: Write a value to this register while transmit/receive halts.

Note 2: Use MOV instruction to write to this register.

Note: Use MOV instruction to write to this register.

Figure 2.4.2. Serial I/O-related registers (1)

M30620FCAFP Datasheet(PDF) 372 Page - Renesas Technology Corp

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