I.MX27L_11 Datasheet, PDF (30/152 Pages) Freescale Semiconductor, Inc – Multimedia Applications Processor Multiple clock and power domains

Signal Descriptions
Table 3. i.MX27/MX27L Signal Descriptions (continued)
Pad Name
Function/Notes
UART1_CTS
Clear to Send output signal; PE14
UART1_RXD
Receive Data input signal; PE13
UART1_TXD
Transmit Data output signal, PE12
UART2_RXD
Receive Data input signal. This signal is multiplexed with KP_ROW6 signal from KPP; PE7.
UART2_TXD
Transmit Data output signal. This signal is multiplexed with KP_COL6 signal from KPP; PE6.
UART2_RTS
Request to Send input signal. This signal is multiplexed with KP_ROW7 signal from KPP; PE4.
UART2_CTS
Clear to Send output signal. This signal is multiplexed with KP_COL7 signal from KPP; PE3.
UART3_RTS
Request to Send input signal, PE11
UART3_CTS
Clear to Send output signal; PE10
UART3_RXD
Receive Data input signal; PE9
UART3_TXD
Transmit Data output signal; PE8
Note: UART 4, 5, and 6 are multiplexed with COMS Sensor Interface signals.
Keypad
KP_COL[5:0]
Keypad Column selection signals. KP_COL[7:6] are multiplexed with UART2_CTS and
UART2_TXD respectively. Alternatively, KP_COL6 is also available on the internal factory test
signal TEST_WB2. The Function Multiplexing Control Register in the System Control chapter
must be used in conjunction with programming the GPIO multiplexing (to select the alternate
signal multiplexing) to choose which signal KP_COL6 is available.
KP_ROW[5:0]
Keypad Row selection signals. KP_ROW[7:6] are multiplexed with UART2_RTS and
UART2_RXD signals respectively. The Function Multiplexing Control Register in the System
Control chapter must be used in conjunction with programming the GPIO multiplexing (to select
the alternate signal multiplexing) to choose which signals KP_ROW6 and KP_ROW7 are
available.
Note: KP_COL[7:6] and KP_ROW[7:6] are multiplexed with UART2 signals as show above, also see UARTs table.
PWM
PWMO
PWM Output. This signal is multiplexed with PC_SPKOUT of PCMCIA, as well as TOUT2 and
TOUT3 of the General Purpose Timer module; PE5.
CSPI (X3)
CSPI1_MOSI
CSPI1_MISO
CSPI1_SS[2:0]
CSPI1_SCLK
CSPI1_RDY
CSPI2_MOSI
CSPI2_MISO
Master Out/Slave In signal, PD31
Master In/Slave Out signal, PD30
Slave Select (Selectable polarity) signal, the CSPI1_SS2 is multiplexed with
USBH2_DATA5/RCV; and CSPI1_SS1 is multiplexed with EXT_DMAGRANT; PD26–28.
Serial Clock signal, PD29
Serial Data Ready signal, shared with Ext_DMAReq_B signal; PD25
Master Out/Slave In signal, multiplexed with USBH2_DATA1/TXDP; PD24
Master In/Slave Out signal, multiplexed with USBH2_DATA2/TXDm; PD23
i.MX27 and i.MX27L Data Sheet, Rev. 1.7
30
Freescale Semiconductor