8-6
MC9328MX1 Reference Manual
MOTOROLA
System Control
8.1.4 Global Clock Control Register
The Global Clock Control Register (GCCR) provides additional power saving capabilities by controlling
the clocks in the following MC9328MX1 modules: DMA, CSI, MMA and USB. It also controls the clock
source for Bootstrap mode.
GCCR
Global Clock Control Register
Addr
0x0021B810
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
BROM_
CLK_EN
DMA_
CLK_EN
CSI_
CLK_EN
MMA_
CLK_EN
USBD_
CLK_EN
TYPE
r
r
r
r
r
r
r
r
r
r
r
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0x000F
Table 8-5. Global Clock Control Register Description
Name
Description
Settings
Reserved
Bits 31–5
Reserved—These bits are reserved and should read 0.
BROM_
CLK_EN
Bit 4
BROM Clock Enable
—Only available in Bootstrap
mode. This bit enables/disables the operational
system boot mode of the MC9328MX1 upon system
reset. The boot mode is determined by the settings of
these pins.
0 = Clock gating is controlled by setting of
BOOT[3:0] pins.
1 = Overrides the setting of the BOOT[3:0]
pins and forces the HCLK to be used as
clock.
DMA_
CLK_EN
Bit 3
DMA Clock Enable
—Enables/Disables clock input to
the DMA module.
0 = DMA clock input is disabled.
1 = DMA clock input is enabled (default).
CSI_
CLK_EN
Bit 2
CMOS Sensor Interface Clock Enable
—
Enables/Disables clock input to the CSI module.
0 = CSI clock input is disabled.
1 = CSI clock input is enabled (default).
MMA_
CLK_EN
Bit 2
Multimedia Accelerator Clock Enable
—
Enables/Disables clock input to the MMA module.
0 = CSI clock input is disabled.
1 = CSI clock input is enabled (default).
USBD_
CLK_EN
Bit 2
USBD Clock Enable
—Enables/Disables clock input
to the USB module.
0 = USB clock input is disabled.
1 = USB clock input is enabled (default).
Содержание DragonBall MC9328MX1
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