18-14
MC9328MX1 Reference Manual
MOTOROLA
Serial Peripheral Interface Modules (SPI 1 and SPI 2)
18.3.7 DMA Control Registers
The SPI DMA control registers allow the user to enable DMA requests when the FIFOs are full, empty, or
half-full. These registers also contain status bits for FIFO full, empty, and half-empty conditions.
DMAREG1
DMAREG2
SPI 1 DMA Control Register
SPI 2 DMA Control Register
Addr
0x00213018
0x00219018
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
THDEN TEDEN RFDEN RHDEN
THDMA TEDMA RFDMA RHDMA
TYPE
rw
rw
rw
rw
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
Table 18-10. SPI 1 DMA Control Register and SPI 2 DMA Control Register Description
Name
Description
Settings
Reserved
Bits 31–16
Reserved—These bits are reserved and should read 0.
THDEN
Bit 15
THDEN
—Enables/Disables the TXFIFO Half
DMA Request.
0 = Disabled
1 = Enabled
TEDEN
Bit 14
TEDEN
—Enables/Disables the TXFIFO
Empty DMA Request.
0 = Disabled
1 = Enabled
RFDEN
Bit 13
RFDEN
—Enables/Disables the RXFIFO Full
DMA Request.
0 = Disabled
1 = Enabled
RHDEN
Bit 12
RHDEN
—Enables/Disables the RXFIFO Half
DMA Request.
0 = Disabled
1 = Enabled
Reserved
Bits 11–8
Reserved—These bits are reserved and should read 0.
THDMA
Bit 7
TXFIFO Half Status
—Indicates when the
transmit FIFO is half-empty.
0 = There are less than 4 empty slots in the TXFIFO
1 = There are at least 4 empty slots in the TXFIFO
TEDMA
Bit 6
TXFIFO Empty Status
—Indicates when the
transmit FIFO is empty.
0 = There is at least one data word in the TXFIFO
1 = The TXFIFO is empty, however data shifting
may still be on-going. To be sure no data
transaction is on-going, read the XCH bit in the
Control Registers.
RFDMA
Bit 5
RXFIFO Full Status
—Indicates when the
receive FIFO is full.
0 = There are less than 8 data words in the RXFIFO
1 = There are 8 data words in the RXFIFO
Summary of Contents for DragonBall MC9328MX1
Page 68: ...1 12 MC9328MX1 Reference Manual MOTOROLA Introduction ...
Page 86: ...2 18 MC9328MX1 Reference Manual MOTOROLA Signal Descriptions and Pin Assignments ...
Page 116: ...3 30 MC9328MX1 Reference Manual MOTOROLA Memory Map ...
Page 126: ...4 10 MC9328MX1 Reference Manual MOTOROLA ARM920T Processor ...
Page 160: ...8 8 MC9328MX1 Reference Manual MOTOROLA System Control ...
Page 272: ...13 32 MC9328MX1 Reference Manual MOTOROLA DMA Controller ...
Page 281: ...Programming Model MOTOROLA Watchdog Timer Module 14 9 ...
Page 282: ...14 10 MC9328MX1 Reference Manual MOTOROLA Watchdog Timer Module ...
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Page 438: ...18 16 MC9328MX1 Reference Manual MOTOROLA Serial Peripheral Interface Modules SPI 1 and SPI 2 ...
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