Datasheet

© 2007 Microchip Technology Inc. DS21618B-page 23
MCP2120
FIGURE 4-9: RXIR and RX Waveforms
TABLE 4-9: RXIR REQUIREMENTS
AC Characteristics
Standard Operating Conditions (unless otherwise specified)
Operating Temperature –40°C ≤ T
A ≤ +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 T
RXBIT Receive Baud Rate Hardware Selection
768 — 768 T
OSC BAUD2:BAUD0 = 000
384 — 384 TOSC BAUD2:BAUD0 = 001
192 — 192 T
OSC BAUD2:BAUD0 = 010
128 — 128 T
OSC BAUD2:BAUD0 = 011
64 — 64 TOSC BAUD2:BAUD0 = 100
Software Selection
BAUD2:BAUD0 = 111
768 — 768 T
OSC Hex Command = 0x87
384 — 384 T
OSC Hex Command = 0x8B
192 — 192 T
OSC Hex Command = 0x85
128 — 128 T
OSC Hex Command = 0x83
64 — 64 T
OSC Hex Command = 0x81
IR130 TRXIRL2RXH RXIR falling edge (↓) to RX
falling edge (↓)
(1)
8TBITCLK
- 8.34 µs
88T
BITCLK
+ 8.34 µs
TBITCLK
IR131A TRXIRPW RXIR pulse width 3 — 3 TOSC
IR132 TRXIRP RXIR bit period
(1)
—16—TBITCLK
Note 1: TBITCLK = TRXBIT/16
BITCLK
RX
RXIR
01 00 01
IR131A
IR110
IR131B
IR131B IR131B
IR131B
IR131B IR131B
IR130
Start Bit Data bit 7 Data bit 6 Data bit 5 Data bit ...
Start Bit Data bit 7 Data bit 6 Data bit 5 Data bit ...