Freescale Semiconductor MCF5480 User Manual

Page 55

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Terminology and Notational Conventions

MCF548x Reference Manual, Rev. 3

Freescale Semiconductor

25.1.2/25-2

Add the following section after section 24.1.2:

24.1.3 Comm Timer External Clock[7:0]
The comm timer external clock is the alternate clock signal and is provided by the user. The user must write
a 1 to CTCR[S] in the variable channel and write a 1001 to CTCR[S] within the fixed channel to select this
signal. If this signal is selected, all timing will be with respect to this clock signal. This signal is restricted to
being half the frequency or less of the system bus clock.

Table 25-3/25-5

In the S bit description change the 1001 setting from “Reserved” to “External clock”

Table 25-4/25-6

The S bit field is incorrect. Bits 31-29 should be reserved, and only bit 28 should be the S bit. And the S bit
description should be:
Clock enable source select. Selects the clock rate for the fixed timer channels. The clock rate for the timer
is the internal system clock divided by an 8-bit prescaler.
1 External Clock
0 Sysclk
Note: The external bus clock cannot be an faster than half the frequency of the system clock.

26.1/26-1

Fix broken cross-reference to Figure 26-1.

Table 26-13/26-19

In description of TXRDY change PSCTFALARM to PSCTFAR

Table 26-30/26-29

In description of ALARM change instance of “less than alarm bytes” to “more than alarm bytes” and change
instance of “more than alarm bytes” to “less than alarm bytes”.

26.3.3.24/26-30

Change bit 30 to reserved, as the WFR field is only one-bit wide.

Figure 26-22/Page

26-32

Remove shading from W field as the PSCRFARn and PSCTFARn

registers are R/W accessible.

26.4/26-35

Add section 15.3.7 “PSC FIFO System” from the

MPC5200 User’s Manual

to before section 26.4.9

“Looping Modes.” Change the following text to apply to the MCF548x:

MPC5200