Programming Model
MOTOROLA
Synchronous Serial Interface (SSI)
30-21
Register (INTENABLEH) must be set to enable the interrupt. Also be sure to enable interrupts to the core
(either the IRQ or FIQ interrupts). After all of these steps are completed, an interrupt is generated when
any of the desired transmit status bits of the SCSR (TDE, TUE, TFS, or TFE) are set.
NOTE:
SSI reset does not affect the STCR bits. Power-on-reset clears all STCR
bits.
STCR
SSI Transmit Configuration Register
Addr
0x0021800C
BIT
31 30 29 28 27
26
25
24
23
22
21
20
19
18
17
16
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15 14 13 12 11
10
9
8
7
6
5
4
3
2
1
0
TXBIT0
TDMAE
TIE
TFEN
TFDIR
TXDIR
TSHFD
TSCKP
TFSI
TFSL
TEFS
TYPE
r
r
r
r
r
r
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
Table 30-10. SSI Transmit Configuration Register Description
Name
Description
Settings
Reserved
Bits 31–11
Reserved—These bits are reserved and should read 0.
TXBIT0
Bit 10
Transmit Bit0
—This bit determines which bit in the Transmit Shift
Register (TXSR) triggers the TXSR to transmit its data word. By
default, shifting of data is triggered by bit position 15 of TXSR. The
shifting data direction (MSB or LSB bit transmitted first) is controlled by
the TSHFD bit.
0 = Bit position 15 of TXSR
triggers transfer
1 = Bit position 0 of TXSR
triggers transfer
TDMAE
Bit 9
Transmit DMA Enable
—Enables DMA requests to be issued when
certain conditions are met.
When the transmit FIFO is enabled and the TDMAE bit is set, a DMA
request is issued when the TFE bit in the SCSR is set.
When the transmit FIFO is disabled and the TDMAE bit is set, a DMA
request is issued when the TDE bit in the SCSR is set.
The TIE bit (in this register) has higher priority than the TDMA bit.
When TIE is set, an interrupt is generated to the CPU instead of the
DMA.
0 = No DMA request
issued
1 = DMA request issued
Содержание DragonBall MC9328MX1
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