UART Environments
12-6
12.2 UART Environments
Each UART is controllable through a TIPB switch, either by the MPU (default)
or the DSP.
12.2.1 UART1 Environment
UART1 is a UART modem with autobaud capability. Table 12–2 lists the
UART1 modem signals accessible at the OMAP5910 level.
Table 12–2. Available UART1 Signals
Generic UART Signal Name
Description
UART1 Signal Name
RX
Serial data input
UART1.RX
TX
Serial data output
UART1.TX
CTS
Clear to send input
UART1.CTS
RTS
Request to send input
UART1.RTS
DTR
Data transmit ready output
UART1.DTR
DSR
Data set ready input
UART1.DSR
The functional clock is either a 12-MHz or a 48-MHz clock. You can select the
clock with the CONF_MOD_UART1_CLK_MODE_R bit (29) of the
MOD_CONF_CTRL_0 register (see Section 6.8, OMAP5910 Configuration
Registers) as follows:
-
CONF_MOD_UART1_CLK_MODE_R = 0: 12 MHz (default)
-
CONF_MOD_UART1_CLK_MODE_R = 1: 48 MHz
NDMA_REQ [1:0] are connected to the DMA request [13:12] of both the MPU
system DMA controller and the DSP DMA controller.
NDMA_REQ[1] is a RX request, and NDMA_REQ[0] is a TX request.
NIRQ from UART1 is connected to:
-
The interrupt line IRQ[14] of the MPU level 2 interrupt handler
-
The interrupt line IRQ[5] of the DSP level 2 interrupt handler
