Freescale Semiconductor M9328MX21ADSE user manual Memory Mapped I/O, Input Buffer Signals, Bit

Configuration and Operation

2.3.10Memory Mapped I/O

The ADS uses Memory Mapped I/O to add I/O functions without using the I/O resources of the processor. The following paragraphs describe the I/O functions.

2.3.10.1Input I/O

A memory read of hex address 0xCC80_0000 inputs the state of the ADS signals connected to latches U5 and U7. Table 2-7shows which signal is associated with each data bit.

Table 2-7. Input Buffer Signals

BIT	Signal	Description
BIT 0	SD_WP	Secure Data Write Protect
BIT 1	SW_SEL	Software readable switch
BIT 2	RESET_E_UART	External UART Reset
BIT 3	RESET_BASE	Ethernet controller Reset
BIT 4	CSI_CTL2	Image Sensor control 2
BIT 5	CSI_CTL1	Image Sensor control 1
BIT 6	CSI_CTL0	Image Sensor control 0
BIT 7	UART1_EN	UART1 transceiver enable
BIT 8	UART4_EN	UART4 transceiver enable
BIT 9	LCDON	LCD enable
BIT 10	IRDA_EN	IrDA transceiver enable
BIT 11	IRDA_FIR_SEL	Reserved
BIT 12	IRDA_MD0_B	IrDA SD/Mode (inverted)
BIT 13	IRDA_MD1	Reserved
BIT 14	LED4_ON	LED 4 control
BIT 15	LED3_ON	LED 3 control

	M9328MX21ADSE User’s Manual, Rev. A
2-10	Freescale Semiconductor