R8CSLASH20 datasheet(283/501 Pages) RENESAS

283 / 501 page

R8C/20 Group, R8C/21 Group

15. Serial Interface

Rev.2.00 Aug 27, 2008

Page 267 of 458

REJ09B0250-0200

Figure 15.3

Registers UiTB, UiRB, and UiBRG (i = 0 or 1)

UARTi Transmit Buffer Register (i = 0 or 1)

(1,2)

Symbol

Address

After Reset

U0TB

00A3h-00A2h

Indeterminate

U1TB

00ABh-00AAh

Indeterminate

NOTES:

(b15)

(b8)

Use the MOV instruction to w rite to this register.

—

Nothing is assigned. If necessary, set to 0.

When read, the content is indeterminate.

—

(b15-b9)

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

Function

Bit Symbol

—

(b8-b0)

Transmit data

UARTi Receive Buffer Register (i = 0 or 1)

(1)

Symbol

After Reset

U0RB

Indeterminate

U1RB

Indeterminate

NOTES:

—

(b7-b0)

—

Function

Receive data (D7 to D0)

Receive data (D8)

—

(b8)

—

(b15)

(b8)

Bit Symbol

Bit Name

Address

00A7h-00A6h

00AFh-00AEh

OER

Overrun error flag(2)

0 : No overrun error

1 : Overrun error

0 : No parity error

1 : Parity error

FER

Framing error flag(2)

0 : No framing error

1 : Framing error

Nothing is assigned. If necessary, set to 0.

When read, the content is indeterminate.

—

(b11-b9)

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). Also, the PER and FER bits are set to 0 w hen the

higher byte of the UiRB register is read out.

SUM

Error sum flag(2)

0 : No error

1 : Error

PER

Parity error flag(2)

UARTi Bit Rate Register (i = 0 or 1)

(1,2,3)

Symbol

Address

After Reset

U0BRG

00A1h

Indeterminate

U1BRG

00A9h

Indeterminate

Setting Range

NOTES:

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

n+1

After setting the CLK0 to CLK1 bits in the UiC0 register, w rite to the UiBRG register.

Use the MOV instruction to w rite to this register.

Write to this register w hile the serial interface is neither transmitting nor receiving.

00h to FFh

Function

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