Memory Stick Host Controller Operation
MOTOROLA
Memory Stick Host Controller (MSHC) Module
21-11
21.5.7 Serial Clock Divider Operation
The MC9328MX1 MSHC module provides for flexible transfer rate control with a configurable Serial
Clock Divider. Four settings are supported by the Divider: /1, /2, /4, and /8. When internal HCLK is used,
the setting /1 is provided for manufacturer testing and should not be used.
Figure 21-6 illustrates the MSHC module serial clock divider and Table 21-4 provides the settings.
Figure 21-6. MSHC Module Serial Clock Divider
21.5.8 System-Level DMA Transfer Operation
The MSHC module DMA request bit is assigned to DMA_REQ [8] in the MC9328MX1 DMA request
signals. Please refer to the Chapter 13, “DMA Controller,” more detail information. Table 21-5 on
page 21-12 summarizes the important data of the MSHC module to configure the DMA general and DMA
I/O registers. Because the Rx and Tx share the same memory address, only 1 DMA channel can be used for
DMA transfer—that is, it cannot use 2 DMA channels to handle Rx and Tx separately. This implies that
the every time the MSHC module is switched from the transmit to the receive operation or the vice versa,
the DMA registers need to be reconfigured.
Table 21-4. Serial Clock Divider Settings
Source Select Bit
(SRC Bit of MSCLKD)
Divide Bits
(DIV [1:0] of MSCLKD)
Serial Clock
Source
Divide Ratio
SCLKO Output
0
0:0
—
—
Not supported
0
0:1
HCLK
Divide by 2
1/2 HCLK
0
1:0
HCLK
Divide by 4
1/4 HCLK
0
1:1
HCLK
Divide by 8
1/8 HCLK
1
0:0
SCLKI
Divide by 1
SCLKI
1
0:1
SCLKI
Divide by 2
1/2 SCLKI
1
1:0
SCLKI
Divide by 4
1/4 SCLKI
1
1:1
SCLKI
Divide by 8
1/8 SCLKI
SCLK (internal)
MS_SCLKO is generated by this SCLK
DIV 8
DIV 4
DIV 2
DIV 1
SRC
0
1
HCLK
internal
MS_SCLKI
external
1:1
1:0
0:1
0:0
DIV [1:0]
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 ...