Ssi Time Slot Register; Table 30-18 Ssi Time Slot Register Description - Motorola DragonBall MC9328MX1 Reference Manual

Synchronous Serial Interface (SSI)

30.3.11 SSI Time Slot Register

The write-only SSI Time Slot Register (STSR) is used when data should not be transmitted in an available
transmit time slot. For the purposes of timing, the time slot register behaves like an alternate transmit data
register. Instead of transmitting data, the SSI_TXDAT pin is either tri-stated or pulled high, depending on
the setting for that pin in the Pull-Up Enable Register in the GPIO Module. Using this register is important
for avoiding overflow/underflow during inactive time slots.
STSR
BIT 31 30 29
TYPE r r r
0 0 0
RESET
BIT 15 14 13
TYPE w w w
0 0 0
RESET
Name
Reserved Reserved—These bits are reserved and should read 0.
Bits 31–16
DUMMY Dummy Bits—Holds data that is not intended for transmission. This register can be used during
Bits 15–0 inactive time slots.
30-30
SSI Time Slot Register
28 27 26 25
r r r r
0 0 0 0
12 11 10 9
w w w w
0 0 0 0
Table 30-18. SSI Time Slot Register Description
MC9328MX1 Reference Manual
24 23 22 21 20
r r r r
0 0 0 0
0x0000
8 7 6 5
DUMMY
w w w w
0 0 0 0
0x0000
Description
Addr
0x0021801C
19 18 17
r r r r
0 0 0 0
4 3 2 1
w w w w
0 0 0 0
MOTOROLA
16
r
0
0
w
0