Texas Instruments AM335 Series Technical Reference Manual

Functional Description www.ti.com
Configuration mode A and configuration mode B are used during module initialization steps. These modes
enable access to configuration registers, which are hidden in the operational mode. The modes are used
when the module is inactive (no serial data transfer processed) and only for initialization or reconfiguration
of the module.
The value of the UARTi.UART_LCR register determines the register access mode (see Table 19-16).
Table 19-16. UART/IrDA/CIR Register Access Mode Programming (Using UART_LCR)
Mode Condition
Configuration mode A UART_LCR[7] = 0x1 and UART_LCR[7:0] != 0xBF
Configuration mode B UART_LCR[7] = 0x1 and UART_LCR[7:0] = 0xBF
Operational mode UART_LCR[7] = 0x0
19.3.7.1.2 Register Access Submode
In each access register mode (operational mode or configuration mode A/B), some register accesses are
conditional on the programming of a submode (MSR_SPR, TCR_TLR, and XOFF).
Table 19-17 through Table 19-19 summarize the register access submodes.
Table 19-17. Subconfiguration Mode A Summary
Mode Condition
MSR_SPR (UART_EFR[4] = 0x0 or UART_MCR[6] = 0x0)
TCR_TLR UART_EFR[4] = 0x1 and UART_MCR[6] = 0x1
Table 19-18. Subconfiguration Mode B Summary
Mode Condition
TCR_TLR UART_EFR[4] = 0x1 and UART_MCR[6] = 0x1
XOFF (UART_EFR[4] = 0x0 or UART_MCR[6] = 0x0)
Table 19-19. Suboperational Mode Summary
Mode Condition
MSR_SPR UART_EFR[4] = 0x0 or UART_MCR[6] = 0x0
TCR_TLR UART_EFR[4] = 0x1 and UART_MCR[6] = 0x1
19.3.7.1.3 Registers Available for the Register Access Modes
Table 19-20 lists the names of the register bits in each access register mode. Gray shading indicates that
the register does not depend on the register access mode (available in all modes).
Table 19-20. UART/IrDA/CIR Register Access Mode Overview
Address Registers
Offset
Configuration Mode A Configuration Mode B Operational Mode
Read Write Read Write Read Write
0x000 UART_DLL UART_DLL UART_DLL UART_DLL UART_RHR UART_THR
0x004 UART_DLH UART_DLH UART_DLH UART_DLH UART_IER UART_IER
0x008 UART_IIR UART_FCR UART_EFR UART_EFR UART_IIR UART_FCR
0x00C UART_LCR UART_LCR UART_LCR UART_LCR UART_LCR UART_LCR
0x010 UART_MCR UART_MCR UART_XON1_ADD UART_XON1_AD UART_MCR UART_MCR
R1 DR1
3468
Universal Asynchronous Receiver/Transmitter (UART) SPRUH73H–October 2011–Revised April 2013
Submit Documentation Feedback
Copyright © 2011–2013, Texas Instruments Incorporated

Texas Instruments AM335 Series Specifications

General

Brand	Texas Instruments
Model	AM335 Series
Category	Computer Hardware
Language	English