82C51 USART - Datasheet

Contents hide

The 82C51 is a USART (Universal Synchronous Asynchronous Receiver Transmitter) for serial data communication. As a peripheral device of a microcomputer system, the 82C51 receives parallel data from the CPU and transmits serial data after conversion. This device also receives serial data from the outside and transmits parallel data to the CPU after conversion. The 82C51 configures a fully static circuit using silicon gate CMOS technology. Therefore, it operates on extremely low power at 100 mA (max) of standby current by suspending all operations.

Buy Now

82C51 Pinout

82C51 Pin Configuration

Pin Number	Pin Name	Description
1	D2	Data Bit 2
2	D3	Data Bit 3
3	RX	Receive
4	GND	Ground
5	D4	Data Bit 4
6	D5	Data Bit 5
7	D6	Data Bit 6
8	D7	Data Bit 7
9	TXC	Transmit Clock Input (Active Low)
10	WR	Write (Active Low)
11	CS	Chip Select (Active Low)
12	C/D	Command/Data Select
13	RD	Read (Active Low)
14	RXRDY	Read Register Ready
15	TXRDY	Transmitter Register Ready
16	SYNDET/BD	See Data Sheet
17	CTS	Clear To Send (Active Low)
18	TXEMPTY	Transmitter Register Empty
19	TXD	Transmit Output
20	CLK	Clock
21	RESET	Reset
22	DSR	Data Set Ready (Active Low)
23	RTS	Request to Send (Active Low)
24	DTR	Data Terminal Ready (Active Low)
25	RXC	Receive Clock (Active Low)
26	Vcc	Positive Supply
27	D0	Data Bit 0
28	D1	Data Bit 1