7643 datasheet(48/424 Pages) RENESAS

48 / 424 page

Rev.2.00

Aug 28, 2006

page 31 of 103

REJ09B0133-0200

OVERVIEW

FUNCTIONAL DESCRIPTION

7643 Group

UART

Twelve serial data transfer formats can be selected, and the trans-

fer formats used by a transmitter and receiver must be identical.

The transmit and receive shift registers each have a buffer, but the

two buffers have the same address in a memory. Since the shift

written to the transmit buffer register, and receive data is read

from the receive buffer register.

The transmit buffer register can also hold the next data to be

transmitted, and the receive buffer register can hold a character

while the next character is being received.

The transfer speed (baud rate) is expression as follows:

Transfer speed (baud rate) = fi / {(n + 1) ✕ 16 }

n: The contents of UART baud rate generator

fi: Using UART clock prescaling select bits, select any one of

φ, φ/8,

φ/32, φ/256

OER

PER

FER

003416

003516

Receive buffer register 1

Receive buffer register 2

Receive shift register 1

Receive shift register 2

Address 003016

UART mode register

UART control register

Address 003316

Receive buffer full flag (RBF)

Receive buffer full interrupt request (URBF)

Receive summing error interrupt request (UES)

SPdetector

UART character length select bits

7 bits

8 bits

9 bits

detector

P85/URXD

P84/UTXD

Prescaler

1/1

1/8

1/32

1/256

Baud rate generator

ST/SP/PA generator

Clock control circuit

1/16

P86/CTS

RTS control register

P87/RTS

Frequency division

ratio 1/(n+1)

Addresses 003616

Addresses 003116

Character length select bit

Transmit shift register 1

Transmit shift register 2

Transmit buffer register 1

Transmit buffer register 2

Transmit comple flag

(TCM)

Transmit interrupt source select bit

Transmit interrupt

request (UTX)

Transmit buffer empty

flag (TBE)

UART status register

Data bus

UART clock

prescaling

select bits

003416

003516

Address 003216

Fig. 24 UART block diagram

7643 Datasheet(PDF) 48 Page - Renesas Technology Corp

7643 Datasheet(HTML) 48 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL