13-28
MC9328MX1 Reference Manual
MOTOROLA
DMA Controller
13.4.3.8 Channel 0 Bus Utilization Control Register
The Bus Utilization Control register (BUCRx) controls the bus utilization of an enabled channel when the
request enable (REN) bit in channel control register (CCR) is cleared. The channel does not request a
DMA transfer until the counter reaches the count value set in the register except for the very first burst.
This counter is cleared when the channel burst is started. When the count value is set to zero, the DMA
carries on burst transfers one after another until it reaches the value set in count register. In this case, the
user must be careful not to violate the maximum bus request latency of other devices.
NOTE:
This register shares the same address of request time-out register.
Table 13-21. Channel Request Time-Out Registers Description
Name
Description
Settings
Reserved
Bits 31–16
Reserved—These bits are reserved and should read 0.
EN
Bit 15
Enable
—Enables/Disables the DMA request time-out.
0 = Disables DMA request time-out
1 = Enables DMA request time-out
CLK
Bit 14
Clock Source
—Selects the counter of input clock source.
0 = HCLK
1 = 32.768 kHz
PSC
Bit 13
Prescaler Count
—Sets the prescaler of the input clock.
0 = Divide by 1
1 = Divide by 256
CNT
Bits 12–0
Request Time-Out Count
—Contains the time-out count down value for the internal counter. This
value remains unchanged through out the DMA process.
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 ...
Page 300: ...15 18 MC9328MX1 Reference Manual MOTOROLA Analog Signal Processor ASP ...
Page 438: ...18 16 MC9328MX1 Reference Manual MOTOROLA Serial Peripheral Interface Modules SPI 1 and SPI 2 ...
Page 478: ...19 40 MC9328MX1 Reference Manual MOTOROLA LCD Controller ...
Page 574: ...21 32 MC9328MX1 Reference Manual MOTOROLA Memory Stick Host Controller MSHC Module ...
Page 598: ...23 16 MC9328MX1 Reference Manual MOTOROLA Real Time Clock RTC ...
Page 670: ...24 72 MC9328MX1 Reference Manual MOTOROLA SDRAM Memory Controller ...
Page 726: ...25 56 MC9328MX1 Reference Manual MOTOROLA SmartCard Interface Module SIM ...
Page 736: ...26 10 MC9328MX1 Reference Manual MOTOROLA General Purpose Timers ...
Page 854: ...29 18 MC9328MX1 Reference Manual MOTOROLA I2C Module ...
Page 900: ...30 46 MC9328MX1 Reference Manual MOTOROLA Synchronous Serial Interface SSI ...
Page 942: ...32 26 MC9328MX1 Reference Manual MOTOROLA GPIO Module and I O Multiplexer IOMUX ...