GENERAL PURPOSE I/O (GPIO) INTERFACE

Timing

Characteristics

mclk = 20MHz

Unit

Min.

Max.

XTI Edge to GPIO Out Valid (GPIO Out Delay Time)

--

26

ns

XTI Edge to GPIO Out Not Valid (GPIO Out Hold Time)

2

--

ns

GPIO In Valid to XTI Edge (GPIO In Set-up Time)

10

--

ns

XTI Edge to GPIO In Not Valid (GPIO In Hold Time)

6

--

ns

Figure 10. GPIO Timing

t

t

ad

ds

mclk

XALE

XPSEN

OPLOAD

Address

Data

t acc

Figure 9. Timing diagram for External Memory Interface

For the calculation of slowest access time allowed for a memory attached to the M8051, the

MICRO MEMORY INTERFACE

TDA7503

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