MCF52235 datasheet(35/54 Pages) FREESCALE

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Electrical Characteristics

MCF52235 ColdFire Microcontroller Data Sheet, Rev. 7

Freescale Semiconductor

2.5

General Purpose I/O Timing

GPIO can be configured for certain pins of the QSPI, timers, UARTs, FEC, interrupts and USB interfaces. When in GPIO mode,

the timing specification for these pins is given in Table 26 and Figure 6.

The GPIO timing is met under the following load test conditions:

•50 pF / 50

Ω for high drive

•25 pF / 25

Ω for low drive

Figure 6. GPIO Timing

2.6

Reset Timing

Table 26. GPIO Timing

Num

Characteristic

Symbol

Min

Max

Unit

CLKOUT high to GPIO output valid

tCHPOV

—10

CLKOUT high to GPIO output invalid

tCHPOI

1.5

—

GPIO input valid to CLKOUT high

tPVCH

9—

CLKOUT high to GPIO input invalid

tCHPI

1.5

—

Table 27. Reset and Configuration Override Timing

(VDD = 2.7 to 3.6 V, VSS = 0 V, T

= TL to TH)

1 All AC timing is shown with respect to 50% V

DD levels unless otherwise noted.

Num

Characteristic

Symbol

Min

Max

Unit

RSTI input valid to CLKOUT high

tRVCH

9—

CLKOUT high to RSTI input invalid

tCHRI

1.5

—

RSTI input valid time 2

2 During low power STOP, the synchronizers for the RSTI input are bypassed and RSTI is asserted asynchronously to the

system. Therefore, RSTI must be held a minimum of 100ns.

tRIVT

5—

tCYC

CLKOUT high to RSTO valid

tCHROV

—10

CLKOUT

GPIO Outputs

GPIO Inputs

MCF52235 Datasheet(PDF) 35 Page - Freescale Semiconductor, Inc

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