MC9328MX21 Datasheet, PDF (14/106 Pages) Motorola, Inc – i.MX family of microprocessors

Signal Descriptions
Signal Name
SSI2_FS
SSI2_MCLK
SSI3_CLK
SSI3_TXD
SSI3_RXD
SSI3_FS
SAP_CLK
SAP_TXD
SAP_RXD
SAP_FS
I2C_CLK
I2C_DATA
OWIRE
PWMO
KP_COL[7:0]
KP_ROW[7:0]
NVDD
NVSS
Table 2. i.MX21 Signal Descriptions (Continued)
Function/Notes
Frame Sync signal which is output in master and input in slave.
SSI2 master clock. Multiplexed with TOUT.
Serial clock signal which is output in master or input in slave. This signal is multiplexed with
SLCDC2_CLK
Transmit serial data signal which is multiplexed with SLCDC2_CS
Receive serial data which is multiplexed with SLCDC2_RS
Frame Sync signal which is output in master and input in slave. This signal is multiplexed with
SLCDC2_D0.
Serial clock signal which is output in master or input in slave.
Transmit serial data
Receive serial data
Frame Sync signal which is output in master and input in slave.
I²C
I²C Clock
I²C Data
1-Wire
One wire input and output signal. This signal is multiplexed with JTAG RTCK.
PWM
PWM Output. This signal is multiplexed with PC_SPKOUT of PCMCIA, as well as TOUT2 and
TOUT3 of the General Purpose Timer module.
Keypad
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.
Keypad Row selection signals. KP_ROW[7:6] are multiplexed with UART2_RTS and UART2_RXD
signals respectively. Alternatively, KP_ROW7 and KP_ROW6 are available on the internal factory
test signals TEST_WB0 and TEST_WB1 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.
Noisy Supply Pins
Noisy Supply for the I/O pins. There are six (6) I/O voltage rings, NVDD1 through NVDD6.
Noisy Ground for the I/O pins
MC9328MX21 Product Preview, Rev. 1.1
14
Freescale Semiconductor