DAN-132 datasheet(7/9 Pages) EXAR

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DATA COMMUNICATIONS APPLICATION NOTE

DAN132

1.3.5

Firmware Differences Between the TL16C550C and XR16C850

The internal registers in the TL16C550C and XR16C850 are similar but with some exceptions:

R = Read-Only, W = Write-Only, R/W = Read/Write

TABLE 7: XR16C850 AND TL16C550C REGISTER SET DIFFERENCES

A2:A0

R/W

XR16C850

TL16C550C

LCR Bit-7 = 0

001

R/W

Interrupt Enable Register (IER)

• Bit-7 = Auto CTS# Interrupt Enable

• Bit-6 = Auto RTS# Interrupt Enable

• Bit-5 = Xoff Interrupt Enable

Interrupt Enable Register (IER)

• Bit-7 = Not Used

• Bit-6 = Not Used

• Bit-5 = Low Power Mode

010

FIFO Control Register (FCR)

• Bit-5 = TX FIFO Trigger Level Select Bit-1

• Bit-4 = TX FIFO Trigger Level Select Bit-0

FIFO Control Register (FCR)

• Bit-5 = 64 Byte FIFO Enable

• Bit-4 = Not Used

010

Interrupt Status Register (ISR)

• Bit-5 = Auto RTS/CTS Interrupt

• Bit-4 = Xoff or Special Character Interrupt

Interrupt Status Register (ISR)

• Bit-5 = 64 Byte FIFO Enabled

• Bit-4 = Not Used

100

R/W

Modem Control Register (MCR)

• Bit-7 = BRG Prescaler

• Bit-6 = IR Mode Enable

• Bit-5 = XonAny

• Bit-3 = OP2 Control/INT Output Enable in PC Mode

• Bit-2 = OP1 Control/Auto RS485 Enable

Modem Control Register (MCR)

• Bit-7 = Not Used

• Bit-6 = Not Used

• Bit-5 = Auto RTS/CTS Flow Control

Enable

• Bit-3 = OP2 Control

• Bit-2 = OP1 Control

LCR Bit-7 = 0, FCTR Bit-6 = 1

111

Enhanced Mode Select Register (EMSR)

• RX/TX DMA Select, FLVL select - TX or RX FIFO

N/A

111

FIFO Level Register (FLVL)

• Current Level of the TX or RX FIFO

N/A

LCR Bit-7 = 0, DLL = 0x00, DLM = 0x00

000

Device Revision (DREV)

N/A

001

Device ID (DVID)

N/A

LCR = 0xBF

000

FIFO Data Count Register (FC)

N/A

000

Trigger Level Register (TRG)

• Programmable Trigger Levels 1-64 for TX and RX FIFO

N/A

001

R/W

Feature Control Register (FCTR)

• RX/TX Programmable Trigger Level Select, Scratchpad

Swap, Trigger Table Select, Auto RS485 Enable, RX IR

Input Inversion, Auto RTS Hysteresis Select (LSB)

N/A

010

R/W

Enhanced Feature Register (EFR)

• Auto RTS/CTS Enable, Enhanced Functions Enable,

Software Flow Control Select

N/A

100

R/W

XON1

N/A

101

R/W

XON2

N/A

110

R/W

XOFF1

N/A

111

R/W

XOFF2

N/A

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