MAC7200 datasheet(912/976 Pages) FREESCALE

912 / 976 page

Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

834

Freescale Semiconductor

NOTE

Currently, only pins PA8 and PA9 allow usage of non-primary peripheral

mode. For all other pins only MODE[1:0] values of 2’b00 or 2’b01 are

allowed.

This table shows that the chips select lines 3 and 4 from DSPI B are available on pins PG14 and PG15

(with MODE[1:0] = 2’b01) as well as on pins PA8 and PA9 if those are configured to use their secondary

peripheral function (i.e. MODE[1:0] = 2’b10).

34.7.3.1

Driving Multiple Outputs

It is possible to drive the same peripheral outputs on multiple pins. If this is not desired, it is the

responsibility of the user to ensure that the PIM is not configured in this manner. As an example, if pin

PA8 was configured to be in Secondary Peripheral Mode, the DSPI_B CS3 would be driven out on both

PA8 and PG15 simultaneously.

34.7.3.2

Input Multiplexing - Priorities

It is not possible to drive the same peripheral input from multiple pins. In the case where the PIM is

configured in this manner, the following priority scheme will determine which pin will drive the input:

Table 34-47. MODE[1:0] Values

Value

Mode

GPIO Mode

Primary Peripheral Mode

Secondary Peripheral Mode

Tertiary Peripheral Mode

Table 34-48. Peripheral Pins that can be Multiplexed

Primary Peripheral

Function

Secondary Peripheral

Function

Tertiary Peripheral

Function

PA8

FlexBus DATA[8]

DSPI_B CS4

None

PA9

FlexBus DATA[9]

DSPI_B CS3

None

PG14

DSPI_B CS4

None

PG15

DSPI_B CS3

None

Table 34-49. Input Multiplexing Priority

Priority

Mode

highest

Primary Peripheral Mode

medium

Secondary Peripheral Mode

lowest

Tertiary Peripheral Mode

MAC7200 Datasheet(PDF) 912 Page - Freescale Semiconductor, Inc

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