6V7 datasheet(104/298 Pages) RENESAS

104 / 298 page

Rev.1.00

May 18, 2004

page 104 of 296

M306V7MG/MH/MJ/MJA-XXXFP, M306V7FG/FH/FJ/FJAFP

Figure 2.11.4 UARTi transmit buffer register (i = 0 and 2)

(b15)

(b8)

UARTi transmit buffer register

Function

Transmit data (Note)

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

U2TB

037B16, 037A16

Indeterminate

Figure 2.11.5 UARTi receive buffer register (i = 0 and 2)

Symbol

Address

When reset

U0RB

03A716, 03A616

Indeterminate

U2RB

037F16, 037E16

Indeterminate

(b15)

(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

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

Reserved bit

Must always be set to “0”

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

03A016 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 03A6 16 and 037E16) is read out.

2: The Receive Buffer Register (received data and error flag) must be read in one operation by

accessing it wordwise.

Figure 2.11.6 UARTi bit rate generator (i = 0 and 2)

UARTi bit rate generator

Symbol

Address

When reset

U0BRG

03A116

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

*1 Before writing any value, make sure no transmit or receive operation is forbiddew.

*2 Use the MOV instruction to write to this register.

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