System Integration Unit (SIU)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
6-111
6.3.1.157 External Clock Control Register (SIU_ECCR)
The SIU_ECCR controls the timing relationship between the system clock and the external clocks
ENGCLK and CLKOUT. All bits and fields in the SIU_ECCR are read/write and are reset by the
synchronous reset signal.
Figure 6-153. External Clock Control Register (SIU_ECCR)
The following table describes the external clock control fields:
Address: Base + 0x0984
Access: R/W
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
0
0
ENGDIV
0
0
0
0
EBTS
0
EBDF
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Table 6-137. SIU_ECCR Field Descriptions
Bits
Name
Description
0–17
—
Reserved
18–23
ENGDIV
[0:5]
Engineering clock division factor. Specifies the frequency ratio between the system clock
and ENGCLK. The ENGCLK frequency is divided from the system clock frequency
according to the following equation:
The maximum ENGCLK frequency is 66 MHz (132 MHz
÷
2)
Note:
Clearing ENGDIV to 0 is the reset setting. Synchronization between ENGCLK and
CLKOUT cannot be guaranteed when ENGDIV is 0.
24–27
—
Reserved
28
EBTS
External bus tap select. Changes the phase relationship between the system clock and
CLKOUT. Changing the phase relationship so that CLKOUT is advanced in relation to the
system clock increases the output hold time of the external bus signals to a non-zero value.
It also increases the output delay times, increases the input hold times to non-zero values,
and decreases the input setup times. Refer to the
Electrical Specifications
for how the
EBTS bit affects the external bus timing.
0
External bus signals have zero output hold times.
1
External bus signals have non-zero output hold times.
Note:
Do not change EBTS while an external bus transaction is in process.
Engineering clock frequency
System clock frequency
ENGDIV
2
×
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