mcf5407 Freescale Semiconductor, Inc, mcf5407 Datasheet - Page 232
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mcf5407
Manufacturer Part Number
mcf5407
Description
Mcf5407 Coldfire Integrated Microprocessor User
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MCF5407.pdf
(546 pages)
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PLL Operation
Motorola recommends using CLKIN 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 PCLK. Although either
signal can be used as a clock reference, CLKIN leaves more room to meet the bus
specifications than BCLKO, which is generated as a phase-aligned signal to CLKIN.
7.1.1 PLL:PCLK Ratios
The PLL for the MCF5407 is enhanced to support faster processor clock (PCLK)
frequencies. While the MCF5307 supports various PCLK frequencies listed in the electrical
specifications with a clock input (CLKIN) of 1/2 PCLK, the MCF5407 offers a wider range
of clock input ratios and a higher performance processor clock.
Like the MCF5307, the MCF5407 samples clock ratio encodings on the lower data bus bits
at reset to determine the CLKIN-to-PCLK ratio. These bits are DIVIDE[1:0] on the
MCF5307 and are multiplexed with data bits D[1:0]. Because the MCF5407 offers more
divide ratio than the MCF5307, three bits, D[2:0]/DIVIDE[2:0], are provided to offer more
programming options at reset. Also, note that only specific CLKIN ranges are allowed for
each divide ratio on the MCF5407. Table 7-1 shows MCF5407 divide ratio encodings.
7.2 PLL Operation
The following sections provide detailed information about the three PLL modes.
7.2.1 Reset/Initialization
The PLL receives RSTI as an input directly from the pin. Additionally, signals are
multiplexed with D[2:0]/DIVIDE[2:0] while RSTI is asserted. These signals are sampled
during reset and registered by the PLL on the negation of RSTI to provide initialization
information. DIVIDE[2:0] are used by the PLL to set the CLKIN/PCLK ratio.
7.2.2 Normal Mode
CLKIN should be used as the system bus clock in 5407 systems. The CLKIN frequency is
7-2
Table 7-1. Divide Ratio Encodings
D[2:0]/DIVIDE[2:0]
00x–010
MCF5407 User’s Manual
011
100
101
110
111
Multiplier
Reserved
Reserved
3
4
5
6
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