Freescale Semiconductor M9328MX21ADSE Peripheral Selection Switch S1, S1 Switch Settings

Configuration and Operation

Table 2-1. Component Configuration Settings (continued)

Component		Position				Effect
Modem Control Enable	1		2	3	The specified RS-232 control signal of P2 connects to the specified
Jumpers					I/O signal.
(on Base board)					J3	- DTR (pin 4) is controlled by SD2_D0 (output)
J3, DTR					J4	- DSR (pin 6) can be read on SD2_D1 (input)
J4, DSR					J5	- CD (pin 1) can be read on SD2-D2 (input)
J5, CD					J6	- RI (pin 9) can be read on SD2-D3 (input)
J6, RI
	1		2	3	The specified RS-232 control signal of P2 is not connected to any I/O
					signal and cannot be controlled or read.
					J3	- DTR is forced active (positive), SD2_D0 is unused
					J4	- DSR cannot be read, SD2_D1 is unused
					J5	- CD cannot be read, SD2_D2 is unused
					J6	- RI cannot be read, SD2_D3 is unused

2.2.1Peripheral Selection Switch (S1)

S1 is a DIP switch that consists of eight slide switches. Seven of the switches enable and disable software control of the UART transceivers, the IrDA buffers, the Nexus buffer, the touch panel controls, and the buzzer. One switch selects JTAG operation mode.

Table 2-2shows S1 functionality.

		Table 2-2. S1 Switch Settings
Switch Name	Setting		Effect
S1-1, UART1_ON	ON		Forces the UART1 transceiver to be enabled.
	OFF		UART1_EN_B bit controls the UART1 transceiver
S1-2, UART4_ON	ON		Forces the UART4 transceiver to be enabled.
	OFF		UART4_EN_B bit controls the UART4 transceiver
S1-3, IrDA_ON	ON		Forces the IrDA module buffers to be enabled.
	OFF		IrDA_EN bit controls the IrDA buffers
S1-4, NEXUS_EN	ON		Internal test only.
	OFF		Set to OFF for debugging purposes.
S1-5, JTAG _CTRL	ON		Internal test only.
	OFF		ARM Multi-ICE mode selected after TRST.
S1-6, TONE_OUT	ON		The buzzer is controlled by the PWMO output.
	OFF		PWMO is disconnected from the buzzer circuit.
S1-7, PEN_CS_B	ON		CSPI_SS0 controls the chip enable of the Touch controller.
	OFF		Disables CSPI_SS0 control of the Touch controller chip enable.
S1-8, PEN_IRQ_B	ON		UART3_CTS is connected to PENIRQ_B out of the Touch controller.
	OFF		UART3_CTS is not connected to PENIRQ_B out of the Touch controller.*

*PENIRQ_B is not connected to anything.

Figure 2-1shows an example configuration. The switches are set so that the UART1 transceiver and the IrDA module are forced enabled; the UART4 transceiver can be enabled by software; and the NEXUS buffer and buzzer are disabled. In addition, ARM mode JTAG is selected and the LCD touch control signals are enabled.

	M9328MX21ADSE User’s Manual, Rev. A
2-2	Freescale Semiconductor