M16CSLASH1N datasheet(122/238 Pages) RENESAS

122 / 238 page

Rev.1.00

Oct 20, 2004

page 110 of 222

M16C/1N Group

13. Serial I/O

REJ09B0007-0100Z

(b15)

(b8)

UARTi transmit buffer register

Symbol

U0TB

U1TB

Address

00A316, 00A216

00AB16, 00AA16

When reset

Indeterminate

Function

Transmit data (Note 1)

Nothing is assigned.

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

indeterminate.

Note 1: When transfer data length is 9-bit long, write high-byte first then low-byte with byte-size.

UARTi bit rate generator

Symbol

U0BRG

U1BRG

Address

00A116

00A916

When reset

Indeterminate

Function

Values that can be set

Assuming that set value = n, BRGi divides the

count source by n + 1

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 framing error

1 : Framing error found

0 : No parity error

1 : Parity error found

0 : No error

1 : Error found

0 : No overrun error

1 : Overrun error found

Receive data

Invalid

Note 1: Bits 15 to 12 are set to "0" when the serial I/O mode select bits (bit 2 to 0 at addresses 00A016 and 00A816) are set to "0002" or

receive enable bit 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 00A616, and 00AE16) is read out or when this register is read out in word-size.

When reading data from the UARTi receive buffer, data should be read high-byte first then low-byte using byte-size.

(b15)

(b8)

UARTi receive buffer register

Symbol

U0RB

U1RB

Address

00A716, 00A616

00AF16, 00AE16

When reset

Indeterminate

Bit

symbol

Bit name

Function

(During clock synchronous serial I/O mode)

Function

(During UART mode)

Nothing is assigned.

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

indeterminate.

0016 to FF16

Figure 13.3 Serial I/O-related registers (1)

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