pc87591l-n05 National Semiconductor Corporation, pc87591l-n05 Datasheet - Page 154

• Manufacturer Part Number: pc87591l-n05
• Description: Lpc Mobile Embedded Controller
• Manufacturer: National Semiconductor Corporation

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4.0 Embedded Controller Modules
4.9.4
For a summary of the abbreviations used for Register Type, see “Register Abbreviations and Access” on page 32.
USART Register Map
Receive Data Buffer Register (UnRBUF)
Location: USART1 - 00 FD22
Type:
Transmit Data Buffer Register (UnTBUF)
Location: USART1 - 00 FD20
Type:
Baud Rate Pre-Scaler Register (UnPSR)
Byte-wide read/write register containing the 5-bit pre-scaler value in bit 7 (MSB) through bit 3 (LSB) and the upper three bits
of the baud divisor in bit 2 (MSB) through bit 0 (LSB). The register is cleared (00
Location: USART1 - 00 FD2E
Type:
Bit
Name
Bit
Name
Bit
Name
Reset
USART Registers
USART2 - 00 FC22
RO
USART2 - 00 FC20
R/W
USART2 - 00 FC2E
R/W
7
7
7
0
UnRBUF
UnTBUF
UnPSR
UnBAUD
UnFRS
UnMDSL
UnSTAT
UnICTRL
Mnemonic
16
16
16
16
16
16
6
6
6
0
Receive Data Buffer Register
Transmit Data Buffer Register
Baud Rate Pre-Scaler Register
Baud Rate Divisor Register
Frame Select Register
Mode Select Register
Status Register
Interrupt Control Register
UPSC
5
5
5
0
(Continued)
Register Name
154
4
4
4
0
URBUF
UTBUF
3
3
3
0
16
) on reset.
Varies per bit
2
2
2
0
Type
R/W
R/W
R/W
R/W
R/W
RO
RO
UDIV[10]: UDIV[8]
1
1
1
0
0
0
0
0
Revision 1.2