Motorola ColdFire MCF5281 - Manual (Page 424)

UART Modules
23-4 Freescale Semiconductor
Table 23-2. UART Module Memory Map
Register
Width
(bit)
Access Reset Value Section/Page UART0
UART1
UART2
0x00
0x0
0x0
UART Mode Registers 1 (UMR1n), (UMR2n)
1
UMR1n, UMR2n, and UCSRn must be changed only after the receiver/transmitter is issued a software reset command. If
operation is not disabled, undesirable results may occur.
8 R/W 0x00 23.3.1/23-5
23.3.2/23-6
0x04
0x4
0x4
UART Status Register (USRn) 8 R 0x00 23.3.3/23-8
UART Clock Select Register
1
(UCSRn) 8 W See Section 23.3.4/23-9
0x08
0x8
0x8
UART Command Registers (UCRn) 8 W 0x00 23.3.5/23-9
0x0C
0xC
0xC
UART Receive Buffers (URBn) 8 R 0xFF 23.3.6/23-11
UART Transmit Buffers (UTBn) 8 W 0x00 23.3.7/23-12
0x10
0x0
0x0
UART Input Port Change Register (UIPCRn) 8 R See Section 23.3.8/23-12
UART Auxiliary Control Register (UACRn) 8 W 0x00 23.3.9/23-13
0x14
0x4
0x4
UART Interrupt Status Register (UISRn) 8 R 0x00 23.3.10/23-13
UART Interrupt Mask Register (UIMRn) 8 W 0x00
0x18
0x8
0x8
UART Baud Rate Generator Register (UBG1n) 8 W
2
2 Reading this register results in undesired effects and possible incorrect transmission or reception of characters. Register
contents may also be changed.
0x00 23.3.11/23-15
0x1C
0xC
0xC
UART Baud Rate Generator Register (UBG2n) 8 W
2
0x00 23.3.11/23-15
0x34
0x4
0x4
UART Input Port Register (UIPn) 8 R 0xFF 23.3.12/23-15
0x38
0x8
0x8
UART Output Port Bit Set Command Register (UOP1n) 8 W
2
0x00 23.3.13/23-16
0x3C
0xC
0xC
UART Output Port Bit Reset Command Register (UOP0n) 8 W
2
0x00 23.3.13/23-16
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3