R8A66171DD/SP
A2RT (ADVANCED ASYNCHRONOUS RECEIVER & TRANSMITTER)
REJ03F0269-0100
Rev. 1.00
Feb.19.2008
DESCRIPTION
The R8A66171 is an integrated circuit for asynchronous serial data communications. It is used in combination with an 8-bit microprocessor and is produced using the silicon gate CMOS technology. R8A66171 is
the succession product of M66230.
FEATURES
● Baud rate generator
● 4-byte FIFO data buffer for transmission and reception
● Error detection : CRC-CCITT
● Wakeup function
● Majority-voting system by sampling three points of received data
● Transmission / reception data format ( number of bits )
Start bit
1
Data bit
8
Wakeup bit 1 or nil
Parity bit
1 or nil
Stop bit
1 or 2
● Transmission speed
500Kbps (max)
● Access time
ta (/RD-D) : 100ns
● High output current
IOH=-24mA IOL=24mA TxD, /RTS, P0, P1 pins
● Schmitt triggered input RxD, /CTS, /RESET pins
● Wide operating supply voltage range (Vcc=3.0~3.6V or Vcc=4.5~5.5V)
● Wide operating temperature range (Ta=-40~85OC)
APPLICATION
Data communication control that uses microprocessor
PIN CONFIGURATION (TOP VIEW)
D0
24
V CC
2
23
TxD
TRANSMISSION DATA OUTPUT
D2
3
22
RxD
RECEPTION DATA INPUT
D3
4
21
CTS
CLEAR-TO-SEND INPUT
D4
5
20
RTS
REQUEST-TO-SEND OUTPUT
D5
6
19
P0
D6
DATA BUS
1
D1
7
18
P1
PORT OUTPUT
D7
8
17
INT
INTERRUPT OUTPUT
READ CONTROL INPUT
RD
9
16
CS
CHIP SELECT INPUT
WRITE CONTROL INPUT
WR
10
15
RESET
RESET INPUT
COMMAND/DATA C/D
CONTROL INPUT GND
11
14
X1
CLOCK INPUT
12
13
X2
CLOCK OUTPUT
REJ03F269-0100 Rev.1.00 Feb.19.2008
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