Figure 30-1 Mc9328Mx1 Input/Output Block Diagram - Motorola DragonBall MC9328MX1 Reference Manual

Synchronous Serial Interface (SSI)
(FMCR) in the system control module and then setting up the GPIO pins appropriately for
Primary/Alternate and GPIO/Peripheral functions. For more information, see Section 30.2.3, "Pin
Configuration for SSI."
SSI
Transmit Clock
Transmit Frame Sync
Transmit Data
Receive Data
Receive Clock
Receive Frame Sync
Figure 30-1. MC9328MX1 Input/Output Block Diagram
Figure 30-2 shows a block diagram of the SSI. It consists of three control registers to configure the port,
one status register, separate transmit and receive circuits with FIFO registers, and separate serial clock and
frame sync generation for the transmit and receive sections.
30-2
MC9328MX1
GPIO Port B
Alternate
Function
PTB[19]
PTB[18]
PTB[17]
PTB[16]
PTB[15]
PTB[14]
FMCR
Register
GPIO Port C
Primary
Function
PTC[8]
PTC[7]
PTC[6]
PTC[5]
PTC[4]
PTC[3]
MC9328MX1 Reference Manual
SSI_TXCLK
SSI_TXFS
SSI_TXDAT
SSI_RXDAT
SSI_RXCLK
SSI_RXFS
Note: The user may
choose to use Port B
or Port C, but not both.
See Section 30.2.3,
"Pin Configuration for
SSI."
SSI_TXCLK
SSI_TXFS
SSI_TXDAT
SSI_RXDAT
SSI_RXCLK
SSI_RXFS
MOTOROLA