R8CSLASH15 datasheet(139/277 Pages) RENESAS

139 / 277 page

R8C/14 Group, R8C/15 Group

14. Serial Interface

Rev.2.10

Jan 19, 2006

Page 127 of 253

REJ09B0164-0210

Figure 14.3

U0TB, U0RB and U0BRG Registers

UART0 Receive Buffer Register

(1)

Symbol

Address

After Reset

U0RB

00A7h-00A6h

Indeterminate

NOTES :

Nothing is assigned. When w rite, set to “0”.

When read, its content is indeterminate.

—

(b11-b9)

—

(b7-b0)

—

(b8)

—

Function

Receive data (D7 to D0)

Receive data (D8)

(b15)

(b8)

Bit Symbol

Bit Name

OER

Overrun Error Flag(2)

0 : No overrun error

1 : Overrun error

FER

Framing Error Flag(2)

0 : No framing error

1 : Framing error

PER

Parity Error Flag(2)

0 : No parity error

1 : Parity error

Read out the UiRB register in 16-bit unit.

The SUM, PER, FER and OER bits are set to “0” (no error) w hen the SMD2 to SMD0 bits in the UiMR register are set to

“000b” (serial interface disabled) or the RE bit in the U0C1 register is set to “0” (receive disable). The SUM bit is set to

“0” (no error) w hen the PER, FER and OER bits are set to “0” (no error).

The PER and FER bits are set to “0” even w hen the higher byte of the U0RB register is read out.

SUM

Error Sum Flag(2)

0 : No error

1 : Error

UART0 Transmit Buffer Register

(1, 2)

Symbol

Address

After Reset

U0TB

00A3h-00A2h

Indeterminate

NOTES :

(b15)

(b8)

When the transfer data length is 9-bit long, w rite to high-byte data first then low -byte data.

Use the MOV instruction to w rite to this register.

Function

—

(b8-b0)

—

(b15-b9)

Transmit data

Nothing is assigned. When w rite, set to “0”.

When read, its content is indeterminate.

UART0 Bit Rate Register

(1, 2, 3)

Symbol

Address

After Reset

U0BRG

00A1h

Indeterminate

Setting Range

NOTES :

Use the MOV instruction to w rite to this register.

Write to this register w hile the serial I/O is neither transmitting nor receiving.

00h to FFh

Function

Assuming that set value is n, U0BRG divides the count source by

n+1

After setting the CLK0 to CLK1 bits of the U0C0 register, w rite to the U0BRG register.

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