MAC7200 datasheet(952/976 Pages) FREESCALE

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General Purpose I/O (PIM) Timing

MAC7200 Microcontroller Family Reference Manual, Rev. 2

874

Freescale Semiconductor

A.10

General Purpose I/O (PIM) Timing

A.10.1

General Purpose Input (GPI)

Table A-19 lists General Purpose Input timings, which are shown in Figure A-2.

These timings are required if the GPIs are used as synchronous inputs in this case the input setup/hold must

be met with respect to the rising edge of the reference clock. The reference clock is the CLKOUT output.

For use as asynchronous inputs the setup and hold constraints don’t need to be maintained, but signals must

be held for a minimum of two system clock cycles.

Figure A-2. General Purpose Input Timing Specifications

A.10.2

General Purpose Output (GPO)

Table A-20 lists General Purpose Output timings, which are shown in Figure A-3.

NOTE

All GPO timings are synchronous; the output delay is specified with respect

to the CLKOUT output.

All other timing relationships can be derived from these values.

Table A-19. General Purpose Input Timing Specifications

Num

Rating1

1. Timing specifications have been indicated taking into account the full slew rate for the pads.

Symbol

Min

Typ

Max

Unit

D CLKOUT

tCYC

—

2000

Data Inputs

D General Purpose Input valid to CLKOUT high (Setup time)

tPVCH

—

D CLKOUT high to General Purpose Input invalid (Hold time)

tCHPI

2—

—

Table A-20. General Purpose Output Timing Specifications

Num

Rating1

Symbol

Min

Typ

Max

Unit

D CLKOUT

tCYC

—

2000

Data Inputs

CLKOUT

Inputs

2.5V

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