mcf5407 Freescale Semiconductor, Inc, mcf5407 Datasheet - Page 480

• Manufacturer Part Number: mcf5407
• Description: Mcf5407 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

Clock Timing Specifications
20.2 Clock Timing Specifications
Table 20-4 shows the MCF5407 PLL encodings. Note that they differ from the MCF5307
DIVIDE[1:0] encodings.
Figure 20-3 correlates CLKIN and core clock frequencies for the 3x–6x multipliers.
25
CLKIN (MHz)
Table 20-5 lists specifications for the clock timing parameters shown in Figure 20-4 and
Figure 20-5. Motorola recommends that CLKIN be used for the system clock. BCLKO is
provided only for compatibility with slower MCF5307 designs. Regardless of the CLKIN
frequency driven at power-up, CLKIN (and BCLKO) have the same ratio value to the
20-4
25
25
25 27
D[2:0]/DIVIDE[2:0]
00x–010
30
32.4
011
100
101
110
111
Supply
35
Figure 20-2. Example Circuit to Control Supply Sequencing
CLKIN
40.5
Figure 20-3. CLKIN-to-Core Clock Frequency Ranges
40
40
Input Clock (MHz)
Regulator
3.3 V
40.0–54.0
25.0–40.5
25.0–32.4
25.0–27.0
45
Table 20-4. Divide Ratio Encodings
50
54
MCF5407 User’s Manual
55
3x
4x
5x
6x
Multiplier
Regulator
3
4
5
6
1.8 V
100
Core Clock (MHz)
100
Reserved
Reserved
110
Core Clock (MHz)
120
120.0–162
100.0–162
125.0–162
150.0–162
120
125
Core Clock
130
140
IV
cc
EV
, PV
PSTCLK (MHz)
cc
150
150
60.0–81.0
50.0–81.0
67.5–81.0
75.0–81.0
cc
162
162
162
162
160
170