MCP2120-IP datasheet(21/36 Pages) MICROCHIP

21 / 36 page

DS21618B-page 21

MCP2120

FIGURE 4-7:

USART ASynchronous Receive Timing

TABLE 4-7:

USART ASYNCHRONOUS RECEIVE REQUIREMENTS

AC Characteristics

Standard Operating Conditions (unless otherwise specified)

Operating Temperature

–40

°C ≤ TA ≤ +85°C (industrial)

Operating Voltage VDD range is described in Section 4.1 “DC

Characteristics”

Param.

No.

Sym

Characteristic

Min

Typ

Max

Units

Conditions

IR110

TRXBIT Receive Baud Rate

Hardware Selection

768

—

768

TOSC

BAUD2:BAUD0 = 000

384

—

384

TOSC

BAUD2:BAUD0 = 001

192

—

192

TOSC

BAUD2:BAUD0 = 010

128

—

128

TOSC

BAUD2:BAUD0 = 011

—

TOSC

BAUD2:BAUD0 = 100

Software Selection

BAUD2:BAUD0 = 111

768

—

768

TOSC

Hex Command = 0x87

384

—

384

TOSC

Hex Command = 0x8B

192

—

192

TOSC

Hex Command = 0x85

128

—

128

TOSC

Hex Command = 0x83

—

TOSC

Hex Command = 0x81

IR111 ERXBIT

Receive (RXIR pin) Baud rate

Error (into MCP2120)

——

IR112 ERXBIT

Receive (RX pin) Baud rate

Error (out of MCP2120)(1)

——

IR113 TTXRF

RX pin rise time and fall time

—

Note 1: This error is not additive to IR111 parameter.

Note:

Refer to Figure 4-2 for load conditions.

IR112

RX pin

IR112

IR110

Start Bit

Data Bit

IR110

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