Freescale Semiconductor M9328MX21ADSE User Manual
Configuration and Operation
M9328MX21ADSE User’s Manual, Rev. A
2-10
Freescale Semiconductor
2.3.10
Memory 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.
The following paragraphs describe the I/O functions.
2.3.10.1
Input I/O
A memory read of hex address 0xCC80_0000 inputs the state of the ADS signals connected to latches U5
and U7. Table 2-7 shows which signal is associated with each data bit.
and U7. Table 2-7 shows 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