Microcontroller User's Manual

MOTOROLA Chapter 23. UART Modules 23-3
Register Descriptions
23.3 Register Descriptions
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.
Table 23-1. UART Module Memory Map
IPSBAR Offset
[31:24] [23:16] [15:8] [7:0]
UART0 UART1 UART2
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
1
—(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
1
—(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
2
—
UART divider upper registers—(UBG1n)
[p. 23-14]
—
0x21C 0x25C 0x29C (Read) Do not access
2
—
UART divider lower registers—(UBG2n)
[p. 23-14]
—
0x234 0x274 0x2B4 (Read) UART input port registers—(UIPn)
[p. 23-15]
—
(Write) Do not access
2
—
0x238 0x278 0x2B8 (Read) Do not access
2
—
(Write) UART output port bit set command
registers—(UOP1n
3
) [p. 23-15]
—