Datasheet

© 2007 Microchip Technology Inc. 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 ≤ 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 TOSC BAUD2:BAUD0 = 000
384 — 384 T
OSC 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 TOSC Hex Command = 0x85
128 — 128 T
OSC Hex Command = 0x83
64 — 64 T
OSC Hex Command = 0x81
IR111 E
RXBIT Receive (RXIR pin) Baud rate
Error (into MCP2120)
——1%
IR112 E
RXBIT Receive (RX pin) Baud rate
Error (out of MCP2120)
(1)
——1%
IR113 T
TXRF RX pin rise time and fall time — — 25 ns
Note 1: This error is not additive to IR111 parameter.
Note: Refer to Figure 4-2 for load conditions.
IR112
RX pin
IR112
IR110
IR110 IR110
Start Bit Data Bit Data Bit Data Bit
IR110