ST16C1450(2005) Просмотр технического описания (PDF) - Exar Corporation

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производитель

ST16C1450
(Rev.:2005)

2.97V TO 5.5V UART

Exar Corporation 

ST16C1450

2.97V TO 5.5V UART

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REV. 4.2.1

3.0 UART INTERNAL REGISTERS

The 1450 has a set of configuration registers selected by address lines A0, A1 and A2. The 16C450

compatible registers can be accessed when LCR[7] = 0 and the baud rate generator divisor registers can be

accessed when LCR[7] = 1. The complete register set is shown on Table 2 and Table 3.

TABLE 2: ST16C1450 UART INTERNAL REGISTERS

A2,A1,A0 ADDRESSES

REGISTER

READ/WRITE

0 00

RHR - Receive Holding Register

THR - Transmit Holding Register

Read-only

Write-only

0 00

DLL - Div Latch Low Byte

Read/Write

0 01

DLM - Div Latch High Byte

Read/Write

0 01

IER - Interrupt Enable Register

Read/Write

0 10

ISR - Interrupt Status Register

Reserved

Read-only

Write-only

0 11

LCR - Line Control Register

Read/Write

1 00

MCR - Modem Control Register

Read/Write

1 01

LSR - Line Status Register

Reserved

Read-only

Write-only

1 10

MSR - Modem Status Register

Reserved

Read-only

Write-only

1 11

SPR - Scratch Pad Register

Read/Write

COMMENTS

LCR[7] = 0

LCR[7] = 1

LCR[7] = 0

LCR[7] = 0

10

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