Freescale Semiconductor M9328MX21ADSE Mode/User Switch S2, Boot Mode Switch Settings, S2-3

Configuration and Operation

1 2	ON
3
4
5 6
7
8

UART1_ON

UART4_ON IrDA_ON NEXUS_ON, (Set to OFF) JTAG_CTRL, (Set to OFF)

TONE_OUT

PEN_CS_B

PEN_IRQ_B

S1

Figure 2-1. Switch S1

2.2.2Mode/User Switch (S2)

S2 is a DIP switch that consists of eight slide switches. S2-1 to S2-4 configure boot mode and S2-5 and S2-6 control the clock bypass modes. These switch settings take effect only on power up or after a reset. S2 also provides two user definable switches (S2-7 and S2-8). S2-7 can be used to cause an interrupt when switched (SW1_IRQ through signal UART3_CTS).

Table 2-3lists the settings for the boot-mode subswitches, S2-1 through S2-4.

.	Table 2-3. Boot Mode Switch Settings
	Boot Mode, Device	BOOT3	BOOT2	BOOT1	BOOT0
		S2-4	S2-3	S2-2	S2-1
	Internal bootstrap ROM (USB/UART)	ON	ON	ON	ON/OFF
	NAND, 8-bit, 2KB per page	ON	ON	OFF	ON
	NAND, 16-bit, 2KB per page	ON	ON	OFF	OFF
	NAND, 16-bit, 512bytes per page	ON	OFF	ON	ON
	CS0, 16-bit, D[15:0]	ON	OFF	ON	OFF
	CS0, 32-bit	ON	OFF	OFF	ON
	NAND 8-bit, 512bytes per page	ON	OFF	OFF	OFF

Figure 2-2shows an example configuration. S2-1 through S2-4 configure the system to boot from the 8-bit NAND Flash. S2-5 and S2-6 are always set to OFF. S2-7 and S2-8 are set for user-defined functions.

1 2	ON
3
4
5 6
7
8

S2

BOOT0

BOOT1

BOOT2

BOOT3

CLKMODE0, (Set to OFF) CLKMODE1, (Set to OFF)

SW1 IRQ

SW2 READ

Figure 2-2. Switch S2

	M9328MX21ADSE User’s Manual, Rev. A
Freescale Semiconductor	2-3