Figure 30-6 Transmit Data Path (Txbit0 = 0, Tshfd = 0); Table 30-4 Data Bit Shifting Configuration - Motorola DragonBall MC9328MX1 Reference Manual

Synchronous Serial Interface (SSI)
The Transmit Shift Direction (TSHFD) bit and Transmit Bit Position(TXBIT0) in the STCR determines
how the data is transmitted. Table 30-4 displays the data bit shifting configuration and Figure 30-6 through
Figure 30-9 visually the data path for each configuration.
TXBIT0
SSI_TXDAT
Figure 30-6. Transmit Data Path (TXBIT0 = 0, TSHFD = 0)
30-10
Table 30-4. Data Bit Shifting Configuration
TSHFD WL[1:0]
0 0 xx
0 1 00
0 1 01
0 1 10
0 1 11
1 0 00
1 0 01
1 0 10
1 0 11
1 1 xx
8-Bit Word
10-Bit Word
15 14 13 12 11 10 9
15 14 13 12 11 10 9
Bit 15 is shifted out first.
The number of bits shifted is based on word length.
MC9328MX1 Reference Manual
Shifting from Bit
Bit 15 (MSB) first
Bit 8 (LSB) first, bit 15 (MSB) last
Bit 6 (LSB) first, bit 15 (MSB) last
Bit 4 (LSB) first, bit 15 (MSB) last
Bit 0 (LSB) first, bit 15 (MSB) last
Bit 7 (MSB) first, bit 0 (LSB) last
Bit 9 (MSB) first, bit 0 (LSB) last
Bit 11 (MSB) first, bit 0 (LSB) last
Bit 15 (MSB) first, bit 0 (LSB) last
Bit 0 (LSB) first
12-Bit Word
16-Bit Word
8 7 6 5 4
8 7 6 5 4
3 2 1 0
STX
3 2 1 0
TXSR
MOTOROLA