Motorola MCF5281 用户手册

MOTOROLA

Chapter 23.  UART Modules  

23-3

This section contains a detailed description of each register and its specific function.
Flowcharts in Section 23.5.6, “Programming,” describe basic UART module
programming. The operation of the UART module is controlled by writing control bytes
into the appropriate registers. Table 23-1 is a memory map for UART module registers.

0x200

0x240

0x280

UART mode registers

 1

—(UMR1n) [p. 23-4], 

(UMR2n) [p. 23-6]

—

0x204

0x244

0x284

(Read) UART status registers—(USRn) [p. 23-7]

—

(Write) UART clock select register

—(UCSRn) 

[p. 23-8] 

—

0x208

0x248

0x288

(Read) Do not access

 2

—

(Write) UART command registers—(UCRn) 
[p. 23-9]

—

0x20C

0x24C

0x28C

(UART/Read) UART receive buffers—(URBn) 
[p. 23-11]

—

(UART/Write) UART transmit buffers—(UTBn) 
[p. 23-11]

—

0x210

0x250

0x290

(Read) UART input port change 
registers—(UIPCRn) [p. 23-12]

—

(Write) UART auxiliary control 
registers

—(UACRn) [p. 23-13]

—

0x214

0x254

0x294

(Read) UART interrupt status registers—(UISRn) 
[p. 23-13]

—

(Write) UART interrupt mask 
registers—(UIMRn) [p. 23-13]

—

0x218

0x258

0x298

(Read) Do not access

—

UART divider upper registers—(UBG1n) 
[p. 23-14]

—

0x21C

0x25C

0x29C

(Read) Do not access

—

UART divider lower registers—(UBG2n) 
[p. 23-14]

—

0x234

0x274

0x2B4

(Read) UART input port registers—(UIPn) 
[p. 23-15]

—

(Write) Do not access

—

0x238

0x278

0x2B8

(Read) Do not access

—

(Write) UART output port bit set command 
registers—(UOP1n

 3

—