Philips LPC2101 - UART1 Auto-Baud Control Register (U1 ACR - 0 Xe001 0020); UART1 Scratch Pad Register (U1 SCR - 0 Xe001 001 C)

© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
User manual Rev. 01 — 12 January 2006 113
Philips Semiconductors
UM10161
Volume 1 Chapter 10: UART1
10.3.13 UART1 Scratch Pad Register (U1SCR - 0xE001 001C)
The U1SCR has no effect on the UART1 operation. This register can be written and/or
read at user’s discretion. There is no provision in the interrupt interface that would indicate
to the host that a read or write of the U1SCR has occurred.
10.3.14 UART1 Auto-baud Control Register (U1ACR - 0xE001 0020)
The UART1 Auto-baud Control Register (U1ACR) controls the process of measuring the
incoming clock/data rate for the baud rate generation and can be read and written at
user’s discretion.
Table 113: UART1 Modem Status Register (U1MSR - address 0xE001 0018) bit description
Bit Symbol Value Description Reset value
0 Delta CTS
0
Set upon state change of input CTS. Cleared on an U1MSR read. 0
No change detected on modem input, CTS.
1 State change detected on modem input, CTS.
1 Delta DSR
0
Set upon state change of input DSR. Cleared on an U1MSR read. 0
No change detected on modem input, DSR.
1 State change detected on modem input, DSR.
2 Trailing Edge RI
0
Set upon LOW to HIGH transition of input RI. Cleared on an U1MSR read. 0
No change detected on modem input, RI.
1 LOW-to-HIGH transition detected on RI.
3 Delta DCD
0
Set upon state change of input DCD. Cleared on an U1MSR read. 0
No change detected on modem input, DCD.
1 State change detected on modem input, DCD.
4 CTS Clear To Send State. Complement of input signal CTS. This bit is connected
to U1MCR[1] in modem loopback mode.
0
5 DSR Data Set Ready State. Complement of input signal DSR. This bit is connected
to U1MCR[0] in modem loopback mode.
0
6 RI Ring Indicator State. Complement of input RI. This bit is connected to
U1MCR[2] in modem loopback mode.
0
7 DCD Data Carrier Detect State. Complement of input DCD. This bit is connected to
U1MCR[3] in modem loopback mode.
0
Table 114: UART1 Scratch Pad Register (U1SCR - address 0xE001 0014) bit description
Bit Symbol Description Reset value
7:0 Pad A readable, writable byte. 0x00
Table 115: Auto-baud Control Register (U1ACR - 0xE001 0020) bit description
Bit Symbol Value Description Reset value
0 Start This bit is automatically cleared after auto-baud
completion.
0
0 Auto-baud stop (auto-baud is not running).
1 Auto-baud start (auto-baud is running).Auto-baud run
bit. This bit is automatically cleared after auto-baud
completion.