R8A66171SP RENESAS [Renesas Technology Corp], R8A66171SP Datasheet - Page 2

• Manufacturer Part Number: R8A66171SP
• Description: A2RT (ADVANCED ASYNCHRONOUS RECEIVER & TRANSMITTER)
• Manufacturer: RENESAS [Renesas Technology Corp]

R8A66171DD/SP
FUNCTION
The R8A66171 is a UART (Universal Asynchronous Receiver/Transmitter) and is used in the peripheral
circuit of a MCU. The R8A66171 receives parallel data, converts into serial format, and then transmits the
serial data via the TxD pin. The device also receives data via the RxD pin from external circuits and converts
it into parallel format, and sends the parallel data via the data bus.
BLOCK DIAGRAM
REJ03F269-0100 Rev.1.00 Feb.19.2008
Page 2 of 22
Command/Data control
Write control input
Read control input
Chip select input
Reset input
Clock output
Clock input
Data bus
input
RESET
C/D
WR
RD
CS
D0
D1
D2
D3
D4
D5
D6
D7
X1
X2
15
11
10
16
14
13
9
1
2
3
4
5
6
7
8
CONTRO
CIRCUIT
BUFFER
WRITE
READ/
DATA
BUS
L
8
8
8
8
8
8
TRANSMIT CONTROL, ERROR DETECTION CODE
RECEIVE CONTROL, ERROR DETECTION(CRC) CIRCUIT
TRANSMIT DATA BUFFER
GENERATOR
RECEIVE DATA BUFFER
BAUD RATE
STATUS REGISTER
COMMAND
4-BYTE FIFO
REGISTER
4-BYTE FIFO
GENERATION(CRC) CIRCUIT
1/16 DIVISION
SAMPLING CLOCK
CIRCUIT
TRANSMIT
RECEIVE
BUFFER
BUFFER
TRANSFER
CLOCK
24
12
23
21
20
22
19
18
17
R
P0
P1
INT
V
GND
T
CTS
RTS
CC
X
X
D
D
Transmission data
output
Clear-to-send
input
Request-to-send
output
Reception data
input
Port output
Interrupt output